The damage from Ukraine’s first-ever strike with American-supplied M39 missiles, targeting a pair of helicopter bases in Russian-occupied southern and eastern Ukraine, likely resulted in greater damage than even the Ukrainian defense ministry initially claimed.

Far greater.

The Ukrainians claimed the Oct. 17 attack, which reportedly saw three of the M39s strike airfields outside Berdyansk in southern Ukraine as well as in Luhansk Oblast in the east, destroyed nine Russian helicopters.

In fact, the M39 raid put out of action 21 helicopters, according to an analysis of commercial satellite imagery by GeoConfirmed, an open-source intelligence practitioner on the social-media site formerly known as Twitter.