For You Civil War History Buffs

Here's a Brain Teaser

On this the 150th anniversary of General George Pickett's ill-fated charge of his Confederate forces at Gettysburg .........

In what battle did then Captain George Pickett  lead 461 American troops of the Union Army?  The war thus engendered went on for 12 years, although Pickett was not in-command throughout.

Hint #1: It was our final armed conflict with Great Britain.

Hint #2: Knowing clipper's perambulations since retirement 20+ years ago, might suggest an answer.

Post your replies in "comments" below.   Winner gets bragging rights.    Answer will be appended HERE in a few days.