Some more details about the Germans:
According to 3rd Panzer Group daily situation maps, on July 7th Senno was occupied by the 7th Panzer division motorcycle battalion(+) and reinforced later in the day by a KG. Most of the rest of the division was about 30 kilometers to the north and the space between was coverer by 7th Recon. Battalion.
On July 6th 7th Panzer Division had the following KGs:
KG Schutzen Brigade 7
Pz. Rgt. 25 (minus III.) with Pz.Fl. 101
I./S.R. 6
S.R. 7 (minus II.)
A.R. 78 (minus 2. battery and 2. battalion)
Pz. Jg. 42 (minus one platoon from 3.)
1./Nb. 51
2 platoons from 1./Pz.Jg. 8 (8,8)
3./Fla. 59
KG Thomale
III./Pz.Rgt. 25
5./A.R. 78
Pz. A.A. 37
6./S.R.6
Kradsch. Btl. 7
Kradsch. 7
2./A.R. 78
1 platoon from 3./Pz.Pi. 58
1 platoon from 2./Flak 84
KG von Unger
II./S.R. 6
II./S.R. 7
I./Nbl. 51
II./A.R. 78
4./Flak 84
KG von Unger seems to have been behind KG S.B. 7
(There were some small detachments to other divisions, so all of the batteries and battalions are not included in the above)
On July 8th KG von Unger had been consolidated into KG S.B. 7.
If you read about the battle starting on page 382 in
The Initial Period of War on the Eastern Front 22 June - August 1941, it's apparent that the units in question are KG Thomale and the motorcycle battalion group.
For the next couple of days, the Soviet 7th Mechanized Corps attacked 7th Panzer Division between Senno and the Northern Dvina and 17th and 12th Panzer divisions dealt with the 5th Mechanized Corps's attack southwest of Senno. 7th PzD, the right flank of 39th Panzer Corps, fought a defensive action while the 39th's schwerpunkt, 20th Panzer Division supported by 20th Infantry Division (mot.), out-flanked the Soviets to the north and seized Vitebsk on July 9th.
If I could figure out how to post an image, I'd show you the relevant situation maps.....
7th Pz.D.'s losses were:
6 July: 10 dead, 69 wounded, 1 missing
7 July: 48 dead, 152 wounded, 2 missing
8 July: 35 dead, 69 wounded, 4 missing
9 July: 15 dead, 43 wounded, 2 missing
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