British Tank Battalions and Companies WW I

Company	Formed	Arrived In France	Notes
A Company	May - 1916	September - 1916	Expanded to become A Battalion in November 1916
B Company	May - 1916	October - 1916	Expanded to become B Battalion in November 1916
C Company	May - 1916	August - 1916	Expanded to become C Battalion in November 1916
D Company	May - 1916	August - 1916	Expanded to become D Battalion in November 1916
E Company	May - 1916		Expanded to become E Battalion in November 1916
F Company	May - 1916		Expanded to become F Battalion in November 1916
G Company	1916		Expanded to become G Battalion in November 1916
H Company	1916		Expanded to become H Battalion in November 1916
The Egyptian Tank Detachment			Originally part of E Battalion, detached to Egypt in December 1916. The strength of the unit was never greater than 8 tanks. They took part in the three assaults on Gaza. Due to no further need for their services, the men returned to the UK in April 1918, leaving their tanks behind.
1st Gun Carrier Supply Company	December - 1917
2^nd Gun Carrier Supply Company	December - 1917
1^st Tank Supply Company	January -1918
2^nd Tank Supply Company	February - 1918
3^rd Tank Supply Company	February - 1918
4^th Tank Supply Company	February - 1918
5^th Tank Supply Company	February - 1918

Battalion Designation Prior to January 1918	Designation In January - 1918	Formed	Notes
A Battalion	1st Battalion	November - 1916	Formed from A Coy
B Battalion	2nd Battalion	November - 1916	Formed from B Coy
C Battalion	3rd Battalion	November - 1916	Formed from C Coy
D Battalion	4th Battalion	November - 1916	Formed from D Coy
E Battalion	5th Battalion	November - 1916	Formed from E Coy
F Battalion	6th Battalion	November - 1916	Formed from F Coy
G Battalion	7th Battalion	November - 1916	Formed from G Coy
H Battalion	8th Battalion	November - 1916	Formed from H Coy
I Battalion	9th Battalion	Late 1916
J Battalion	10th Battalion	Mid - 1917
K Battalion	11th Battalion	Mid - 1917
L Battalion	12th Battalion	Mid - 1917
M Battalion	13th Battalion	Mid - 1917
N Battalion	14th Battalion	Late - 1917
O Battalion	15th Battalion	Jan 1918
	16th Battalion	1918
	17th Battalion	March 1918	Originally formed as Tank Unit and Converted to Armoured Cars April 1918 as the 17th (Armoured Car) Tank Battalion.
	18th Battalion	1918	Formed as a Heavy Battalion
	19th Battalion	September 1918	Formed as a Heavy Battalion
	20th Battalion	September 1918
	21st Battalion	September 1918
	22nd Battalion	September 1918	Formed as a Light Battalion
	23rd Battalion	September 1918	Formed as a Light Battalion
	24th Battalion	November 1918	Formed as a Heavy Battalion
	25th Battalion	November 1918	Formed as a Heavy Battalion
	26th Battalion	October 1918	Formed as a Heavy Battalion

Originally A Company, Expanded to become A Battalion in Nov 1916, redesignated 1^st Battalion in Jan 1918.

Originally B Company, Expanded to become B Battalion in Nov 1916, redesignated 2^nd Battalion in Jan 1918.

Originally C Company, Expanded to become C Battalion in Nov 1916, redesignated 3^rd Battalion in Jan 1918.

Originally D Company, Expanded to become D Battalion in Nov 1916, redesignated 4^th Battalion in Jan 1918.

Originally F Company, Expanded to become F Battalion in Nov 1916, redesignated 6^th Battalion in Jan 1918.

Originally G Company, Expanded to become G Battalion in Nov 1916, redesignated 7^th Battalion in Jan 1918.

Originally H Company, Expanded to become H Battalion in Nov 1916, redesignated 8^th Battalion in Jan 1918.

The 17th Tank Battalion was formed in March 1918 and was redesignated the 17th (Armoured Car) Tank Battalion in April 1918 to reflect change in role (ie converting for Tanks to Armoured Cars).