The crossword solution for the term 'Drawn-Out Campaign' is 'SIEGE'. A SIEGE is a military tactic in which an attacking force surrounds a defended location and isolates it from outside help or supplies. It is usually used to force the surrender of the defenders, either by starvation or by cutting off their access to resources. The term 'drawn-out campaign' implies that the SIEGE was a long and difficult process, with both sides enduring a prolonged period of hardship before one side finally emerged victorious.