21 March 1918 - Tank Battalion OB
1st Tank Battalion OB. 21st March 1918
2nd Tank Battalion OB. 21st March 1918
3rd Tank Battalion OB. 24th March 1918
4th Tank Battalion OB. 21st March 1918
5th Tank Battalion OB. 21st March 1918
8th Tank Battalion OB. 21st March 1918
9th tank battalion, see 3rd tank battalion above.