http://www.telegraph.co.uk/news/worldnews/europe/italy/12076680/Scientists-in-Italy-rediscover-snake-that-was-used-by-ancient-Greeks-as-a-weapon-of-war.html
We have film evidence of Hannibal using similar tactic:
http://www.infobarrel.com/Hannibals_Army_of_Catapulted_Snakes
guy also known as gaius