Sirte is its stronghold. "They're getting stronger because no one is fighting them," said Misrata forces commander Mahmoud Gazwan at the Wadi Bey checkpoint, a dusty outpost serving as a mobile base for his brigade of fighters. There are signs of a growing Western urgency to stop Islamic State (ISIS), and Libyan commanders say Western weapons and air strikes will make a vital difference in the coming battle against their better-armed enemy.