One of the more exciting moments of Ronald D. Moore's reimagined Battlestar Galactica series was the Battle of New Caprica as seen in Exodus Part II during the third season. I wouldn't be able to do the battle justice, so read about it here. I remember a debate that went on after that episode aired on a forum I used to frequent about whether or not Adama should have sacrificed the Galactica and preserved the Pegasus, the former's sister ship commanded by his son, Lee (Apollo). For the sake of anyone who has never seen the series, here's what the Galactica and Pegasus look like.
I like to imagine how the Mercury-classes would operate during a war. Battlestars are designed to operate without resupply for years at a time and judging by the punishment the Galactica took throughout the four seasons of the show, they could handle themselves well. A group of four or even a pair could wreak absolute havoc behind enemy lines.
If you haven't seen the show, the Pegasus is destroyed during the Battle of New Caprica, sacrificing itself to cover the Galactica's escape. A noble death, but a damn shame nonetheless.
Pictures via the Battlestar Wiki.