Poor Bloody Infantry

Glen Cook's Black Company series tells of life in the Black Company Mercenaries. A once great company, they have fallen on hard times and are now working as glorified bodyguards. The series is narrated by Croaker the Company's medic and archivist.
Other characters include the Company magicians/sorcerers One-Eye and Tom-Tom, and the many other individuals who make up this rag-tag group of mercenaries. Cook has a fun ear for dialogue, as his characters never take each other too seriously.
These books are a fun read about a group of losers who make good despite themselves, and somehow come out on top.