USS Enterprise (NCC-1701-C)
Despite being heavily outnumbered, the Enterprise engaged the attackers to defend the outpost. The Enterprise was destroyed, but the Klingons regarded her sacrifice as an act of honor, which led to a change in relations between the Klingon Empire and the United Federation of Planets, eventually leading to an alliance between the two powers.
In the original timeline, the Enterprise-C only destroyed one Romulan Warbird. However, in the modified timeline, the Enterprise-C destroyed two ships and was boarded by the Romulans. A handful of Federation personnel were taken prisoner before the ship exploded, including Tasha Yar.