Round 1: Bare-knuckle brawl
Round 2: Slade has a military machete, and Crowley has a chatchet.
Round 3: Slade has the equipment shown in the above picture, and is hunting Crowley on Crowley's home turf. Crowley has access to all of his equipment.
I wanted to post a clip of Deathstroke ripping apart the soldiers on the Amazo, but I can't find it.