1st heavy artillery regiment
Mobilization	15cm L/12 not QF how. division	1st – 15cm L/12 not QF howitzers battery (4 hows.) 2nd – 15cm L/12 not QF howitzers batteries (4 hows.) 3rd – 15cm L/12 not QF howitzers batteries (4 hows.)
	12cm L/28 not QF division	1st – 12cm L/28 not QF battery (4 guns) 2nd – 12cm L/28 not QF batteries (4 guns) 3rd – 12cm L/28 not QF batteries (4 guns)
	10.5cm L/30 QF division	1st – 10.5cm L/30 QF battery (2 guns) 2nd – 10.5cm L/30 QF battery (2 guns)
	15cm L/14 QF how. division	1st – 15cm L/14 QF howitzers battery (3 hows.) 2nd – 15cm L/14 QF howitzers battery (3 hows.)
25.12.1915	A new 3rd – 10.5cm L/30 QF bty. was raised by the regiment
06.12.1916	1st, 2nd and 3rd – 15cm L/12 not QF how. bts. were rearmed at first with 105mm QF field howitzers, then with 15cm QF Russian howitzers
	1st and 2nd – 12cm L/28 not QF batteries were rearmed with 10.5cm L/35 not QF Romanian guns
18.04.1917	Sofiyski fortress artillery gave the following batteries to the regiment: 1st – 15cm L/30 not QF bty. (2 guns) 2nd – 15cm L/30 not QF bty. (2 guns) 1st – 12cm L/25 not QF bty. (5 guns) 2nd – 12cm L/25 not QF bty. (4 guns) 2nd – 77mm QF field bty. (4 guns) 1st – 87mm L/30 not QF field bty. (6 guns) 2nd – 87mm not QF field bty. (6 guns) 3rd – 87mm not QF field bty. (6 guns) 1st – 57mm turret guns platoon (2 guns) 2nd – 57mm turret guns platoon (2 guns) 3rd – 57mm turret guns platoon (2 guns) 4th – 57mm turret guns platoon (2 guns) 5th – 57mm turret guns platoon (2 guns) 6th – 57mm turret guns platoon (2 guns)
	1st platoon of 4th – 87mm not QF field bty. (2 guns) was raised at Burgas by the regiment
	1st platoon of 3rd – 75mm not QF field bty. (2 guns) was raised at Varna by the regiment
01.08.1917	A new 4th – 87mm not QF field bty. was raised at Varna
?	A 4th new 10cm L/35 QF bty. was raised by the regiment
04.08.1917	6th – 57mm turret guns platoon was disbanded
?	1st – 15cm L/14 QF Krupp how. bty. was rearmed with 15cm L/17 QF howitzers
?	1st platoon of 4th – 87mm not QF field bty. and 1st platoon of 3rd – 75mm not QF field bty. were disbanded
?	2nd – 77mm QF field bty. was rearmed with 75mm QF Schneider Serbian field guns
?	1st – 12cm L/25 not QF bty. was rearmed with 15cm L/14 QF howitzers 13
30.11.1917	The regiment gave the following batteries to 5th heavy art. rgt.: 1st – 15cm L/30 not QF bty. 2nd – 12cm L/25 not QF bty. 3rd – 12cm L/28 not QF field bty. 1st – 57mm turret guns platoon 3rd – 57mm turret guns platoon 4th – 57mm turret guns platoon 5th – 57mm turret guns platoon
	The regiment gave the following batteries to 26th art. rgt.: 1st – 87mm L/30 not QF field bty. 2nd – 87mm not QF field bty. 3rd – 87mm not QF field bty.
29.07.1918	2nd – 57mm turret guns platoon was assigned to the position art. rgt.
17.04.1918	The units of the regiment were renumbered as follows: 1st battery = 1st – 15cm QF Russian howitzers battery 2nd battery = 2nd – 15cm QF Russian howitzers battery 3rd battery = 3rd – 15cm QF Russian howitzers battery 4th battery = 1st – 15cm L/17 QF howitzers battery 5th battery = 2nd – 15cm L/14 QF howitzers battery 6tht battery = 1st – 10,5cm L/30 QF battery 7th battery = 2nd – 10,5cm L/30 QF battery 8th battery = 3rd – 10,5cm L/30 QF battery 9th battery = 4th – 10cm L/35 QF battery 10th battery = 1st – 10.5cm L/35 not QF battery 11th battery = 2nd – 10,5cm L/35 not QF battery 12th battery = 2nd – 15cm L/30 not QF battery 13th battery = 1st – 12cm L/25 not QF battery 14th battery = 2nd – 7,7cm QF field battery 15th battery = 4th – 8,7cm not QF position battery
Sofiyski fortress artillery regiment
Mobilization	15cm L/30 not QF division	1st – 15cm L/30 not QF battery (2 guns) 2nd – 15cm L/30 not QF batteries (2 guns)
	12cm L/25 not QF division	1st – 12cm L/25 not QF battery (5 guns) 2nd – 12cm L/25 not QF batteries (4 guns)
	87mm not QF Krupp field division	1st – 87mm not QF Krupp field battery (6 guns) 2nd – 87mm not QF Krupp field battery (6 guns) 3rd – 87mm not QF Krupp field battery (6 guns)
	1st – 75mm not QF Krupp field battery (6 guns) at Rahovo 2nd – 75mm not QF Krupp field battery (6 guns) at Ruse
	1st – 57mm turret guns platoon (2 guns) at Somovitz 2nd – 57mm turret guns platoon (2 guns) at Svishtov 3rd – 57mm turret guns platoon (2 guns) at Dede Agatch 4th – 57mm turret guns platoon (2 guns) at Dede Agatch 5th – 57mm turret guns platoon (2 guns) at Ruse 6th – 57mm turret guns platoon (2 guns) at Ruse
25.11.1916	1st – 75mm not QF Krupp field bty. was disbanded
	2nd – 75mm not QF Krupp field bty. was rearmed with 77mm QF field guns
18.04.1917	Sofiyski fortress artillery was disbanded and its units were assigned to 1st heavy art. rgt.
Composition of the regiments at the end of the World War