The Roman Camp of Jumbe (Location)
Jumbe is one of the trickiest elephants because he's so damn nimble- it's hard to really lay the hurt on before you have to dodge, and his headswings are pretty deadly. There are two key tips to keeping up with his dance of death. First- the headswings come down diagonally. If he raises his head to your left, dodge left to avoid the strike.
Two- he can't attack with his head and his feet at the same time. If he's rearing up, no more headswing. If he's headswinging, you can run through his legs in safety.
Do use your light bow when possible, but you won't have much time between assaults. Weapons with lifestealing are especially helpful against this martinet. Keep it up to (eventually) take him down.