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RGA Siege Batteries: the largest guns and howitzers, manned by the Royal Garrison Artillery; mounted on railways or on massive fixed concrete emplacements and consequently rather immobile.

RGA Siege Battery number Type Attached to this higher formation, at November 1918 Remarks. All Batteries consisted of four 6-inch guns unless shown. 1 Regular army [Attached to 2nd Division between 4 Feb 1915 and 20 Apr 1915, then joined 12 Brigade RGA].   2 Regular army Fifth Army A 15-inch howitzer battery of 1 gun 3 Regular army Third Army A 15-inch howitzer battery of 1 gun 4 Regular army Second Army A 15-inch howitzer battery of 1 gun 7 [War Diary] Regular army Second Army Formed from UK coast defence gunners and armed with 6-inch guns on mobile mountings. Also included the earliest 9.2-inch howitzer - named "Mother". Was sent to the defence of Antwerp. Later, became a 6-inch gun battery of 4 guns 8 Regular army Third Army Formed from UK coast defence gunners and armed with 6-inch guns on mobile mountings. Later became a 6-inch gun battery of 4 guns 8 Regular army First Army A 15-inch howitzer battery of 1 gun 10 Regular army Third Army A 15-inch howitzer battery of 1 gun 11 Regular army     12 Regular army     13 New armies   The first RGA Siege Battery to be formed for the New Armies 18   Fifth Army A 12-inch railway howitzer battery of 2 guns 22   Second Army A 12-inch railway howitzer battery of 2 guns 26   Third Army   27     Landed in France 5 September 1915 29   Second Army   35   Third Army   44   Fifth Army A 12-inch railway howitzer battery of 2 guns 45   Second Army A 9.2-inch railway gun battery of 2 guns 50   Fourth Army. With IX Corps in attack on Beurevoir Line and River Selle, October 1918. A 6-inch gun battery of 4 guns 52   First Army A 12-inch railway howitzer battery of 2 guns 53 (part)   Second Army A 9.2-inch railway gun battery of 1 gun 53 (part)   Fifth Army A 9.2-inch railway(?) gun battery of 1 gun 58   Third Army   60   First Army   63   Second Army A 12-inch railway howitzer battery of 2 guns 64   Fifth Army A 12-inch railway howitzer battery of 2 guns 65   First Army A 12-inch howitzer battery of 2 guns 71     A 6-inch gun battery of 4 guns; the 3rd (Transvaal) South African Brigade. 72     A 6-inch gun battery of 4 guns; the 4th (Kimberley) South African Brigade. 73     A 6-inch gun battery of 4 guns; the 1st (West Cape) South African Brigade. 74     A 6-inch gun battery of 4 guns; the 2nd (East Cape) South African Brigade. 75     A 6-inch gun battery of 4 guns; the 5th (Natal) South African Brigade. 80   Fourth Army. With IX Corps in attack on Beurevoir Line, October 1918. A 12-inch howitzer battery of 2 guns 82   Second Army A 12-inch railway howitzer battery of 2 guns 83   Third Army A 12-inch railway howitzer battery of 2 guns 85   Second Army A 12-inch howitzer battery of 2 guns 86   First Army A 12-inch railway howitzer battery of 2 guns 89   Third Army A 12-inch railway howitzer battery of 2 guns 92 (part)   Third Army A 12-inch railway gun battery of 1 gun 104   Second Army A 12-inch railway howitzer battery of 2 guns 105   In 24th HAG in December 1917. With British Forces in Italy Nov 1918.   118 [War Diary]       128   Fifth Army A 12-inch railway howitzer battery of 2 guns 137   Joined 45th Heavy Artillery Group (HAG) 27 August 1916. 59th HAG 5 September 1916. 10th HAG 28 September 1916. 68th HAG 13 December 1916. 48th HAG 15 December 1916. 71st HAG 16 May 1917, located at Feuchy Chapel. 84th HAG 28 September 1917. 80th HAG 19 November 1917. Moved to Italy as part of 80th HAG on 24 November 1917, and remained there. Moved to France 13 August 1916. A 6-inch howitzer battery of 4 (26-cwt) howitzers 138   Joined 37th Heavy Artillery Group (HAG) 4 September 1916. 61st HAG 30 September 1916. 37th HAG 15 March 1917. 82nd HAG 16 September 1917. 71nd HAG 16 May 1917. 37th HAG 6 November 1917. 82nd HAG 15 October 1918. 61st HAG 28 October 1918. Moved to Salonika August 1916. A 6-inch howitzer battery of 4 (26-cwt) howitzers 139   Joined 54th Heavy Artillery Group (HAG) 6 August 1916. 8th HAG 12 September 1916. 48th HAG 3 October 1916. 1st HAG 17 October 1916. 19th HAG 2 December 1916. 1st HAG 30 January 1917. 68th HAG 23 March 1917. 78th HAG 25 May 1917. 72nd HAG 10 July 1917. 66th HAG 1 September 1917. 35th HAG 6 September 1917. 24 th HAG 22 September 1917. To GHQ Reserve for rest, 31 October 1917. 63rd HAG 15 November 1917. 78th HAG 24 December 1917. No subsequent changes. Moved to France 1 August 1916. A 6-inch howitzer battery of 4 (26-cwt) howitzers 171   With British Forces in Italy   172   In 24th HAG in December 1917. With British Forces in Italy Nov 1918.   176   Moved to Italy as part of 80th HAG on 24 November 1917, and remained there.   181   Moved to Italy as part of 80th HAG on 24 November 1917, and remained there.   187   See history A 6-inch gun battery of 4 guns 189   Fourth Army. With XIII Corps in attack on River Selle, October 1918.   192   First Army A 6-inch gun battery of 4 guns; also had 1 12-inch railway gun 193   Second Army   197   With British Forces in Italy   222   Fourth Army. With American II Corps in attack on River Selle, October 1918.   229   In 24th HAG in December 1917. With British Forces in Italy Nov 1918.   240   With British Forces in Italy   243   Fourth Army A 12-inch howitzer battery of 2 guns 247   In 24th HAG in December 1917. With British Forces in Italy Nov 1918.   289   Moved to Italy as part of 80th HAG on 24 November 1917, and remained there.   293   With British Forces in Italy   302   Sent directly from England to Italy as part of XCIV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 304   Sent directly from England to Italy as part of XCV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 307   Sent directly from England to Italy as part of XCIV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 309     Formed by the Honourable Artillery Company 312   Fourth Army. With XIII Corps in attack on River Selle, October 1918.   314   Sent directly from England to Italy as part of XCV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 315   Sent directly from England to Italy as part of XCIV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 316   Sent directly from England to Italy as part of XCIV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 317   Sent directly from England to Italy as part of XCIV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 320   Sent directly from England to Italy as part of XCV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 322   Sent directly from England to Italy as part of XCV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 330   Fifth Army   333   Third Army A 12-inch railway howitzer battery of 2 guns 334   Sent directly from England to Italy as part of XCV HAG on 7 April 1917. A 6-inch battery of 4 howitzers 343   Third Army A 12-inch railway howitzer battery of 2 guns 349   Fifth Army A 12-inch howitzer battery of 2 guns 359   Second Army A 12-inch railway howitzer battery of 2 guns 363   Third Army A 9.2-inch railway gun battery of 2 guns 366   First Army A 9.2-inch railway gun battery of 2 guns 374   Fourth Army A 15-inch howitzer battery of 1 gun 375   Second Army   381   Second Army A 12-inch railway howitzer battery of 2 guns 390   Sent directly from England to Italy and attached to XCV HAG in July 1917. A 6-inch battery of 4 howitzers 391   Sent directly from England to Italy and attached to XCV HAG in July 1917. A 6-inch battery of 4 howitzers 392   Sent directly from England to Italy and attached to XCV HAG in July 1917. A 6-inch battery of 4 howitzers 393   First Army   394   Sent directly from England to Italy as part of 101st HAG in July 1917. A 6-inch battery of 4 howitzers 395   Sent directly from England to Italy as part of 101st HAG in July 1917. A 6-inch battery of 4 howitzers 396   Sent directly from England to Italy as part of 101st HAG in July 1917. A 6-inch battery of 4 howitzers 409   Third Army   431   Third Army A 12-inch howitzer battery of 2 guns 434   Third Army   438   With British Forces in Italy   442   Third Army A 9.2-inch railway gun battery of 2 guns 444   First Army A 12-inch railway howitzer battery of 2 guns 449   Fourth Army. With XIII Corps in attack on River Selle, October 1918.   450   First Army   461   First Army A 9.2-inch railway gun battery of 2 guns 471 (part)   First Army A 14-inch railway howitzer battery section of 1 gun 471 (part)   Fourth Army A 14-inch railway howitzer battery section of 1 gun 479   Second Army   481   Fifth Army   484   Third Army   488   First Army   493   First Army A 12-inch howitzer battery of 2 guns 494   Fourth Army A 12-inch howitzer battery of 2 guns 495   Third Army A 12-inch railway howitzer battery of 2 guns 498   Fourth Army. With IX Corps in attack on Beaurevoir Line and River Selle, October 1918.   499   Fourth Army. With IX Corps in attack on Beurevoir Line and American II Corps in attack on River Selle, October 1918.   500   Third Army   503   Third Army   504   Fourth Army. With American II Corps and later XIII Corps in attacks on River Selle, October 1918.   514   First Army A 12-inch railway howitzer battery section of 1 gun 515   First Army A 14-inch railway howitzer battery section of 1 gun 520   First Army   521   First Army (or Fifth?)   523   First Army A 9.2-inch railway gun battery of 2 guns 524   Fifth Army A 12-inch railway howitzer battery of 2 guns 525   Third Army   526   Second Army   527   First Army   528   Second Army   543   First Army A 12-inch railway howitzer battery of 1 gun 543   Fourth Army A 12-inch railway howitzer battery of 1 gun 543 ? (part)   Fourth Army A 9.2-inch railway gun battery of 1 gun 544   First Army (or Fifth?)   545   See history   546   Second Army   546 ? (part)   Fourth Army A 9.2-inch railway gun battery of 1 gun 1st Royal Marine Artillery Siege Battery   Fourth Army. With IX Corps in attack on Beaurevoir Line, October 1918. A 12-inch howitzer battery