Crazy Tom brought his two surviving fighters in through the gap and caused havoc with the enemy, and though his ships and Shen’s as well were finally destroyed, Fly Molo was able to mop up and complete the victory.
There are no more uses of "havoc" in the book.
Show samples from other sources
The virus wreaked (caused) havoc in our computer system.
The storm played (caused) havoc with our vacation plans.