Joe,

I've had a look at U 38's KTB, and based upon what's in there, there isn't enough evidence to credit U 38 with damaging ANTINOUS. (A listing in the ships damaged section of "Lloyd's War Losses" isn't enough as LWL includes some ships there that weren't actually damaged.)

Based upon the description in the KTB and what's in BVLAS, this apparently is a torpedo miss on September 1, 1916 with U 38 then surfacing and opening fire on an armed steamer. Valentiner soon broke off the action.

U 38 also had a short firefight with an armed steamer the next day.

In neither case did U 38 claim to have to have hit the steamer.

Best wishes,
Michael