Elia,
From the
Luftwaffe Officers Career Notes provided by de Zeng and Stankey
"BOLTENSTERN, Hans-Albert, Freiherr von. 01.05.37 Hptm., appt Staka 1./KG 157 (to 30.04.39), then
Staka 1./KG 27 (to 08.04.40). 17.05.40 Hptm., appt Staka 14.(Z)/LG 1 (to 26.06.40). 16.08.40
Hptm., appt Kdr. Erprobungsgruppe 210 (to 04.09.40). 04.09.40 Hptm., Kdr. Erp.Gr. 210 KIA - Bf
110 D-0 (S9+AB) shot down by 234 and 601 Sqdns RAF and crashed 2 miles off Littlehampton)."