a) To have a strong effect on something
b) To force someone into naval services.
[Rorke's drift] was an impressive battle.
The anglo-american war (or war of 1812, if it's the only war your country was in at the time, aka you are from north america) resulted in the treaty of Ghent. However, this did not resolve any of the issues the united states had fought for. However, as a courtesy, Impressing stopped. See [war of 1812]