Col. Muammar Qaddafi has gained the upper hand on the Libyan battlefield, even as British and other Western officials maintain that his regime is "crumbling" from the inside. Benefiting from a change in tactics, Colonel Qaddafi's forces have made significant gains against rebels with more nimble units that are harder for Western allies to target by air. Rebels, now lacking the curtain of airstrikes that paved their rapid westward advance last weekend, appear to be relinquishing their determination to battle Qaddafi's forces all the way to Tripoli.