Examples from literature

• A dispute arising on this point, the two noble generals came to fisticuffs, and in the fracas our brave commander got his remaining well eye badly damaged. 
• It is as though they were on the point of breaking into fisticuffs. 
• Let fisticuffs settle it! 
• The situation was growing strained, and might well culminate in fisticuffs. 
• Tom would have been glad to challenge him to a bout at fisticuffs, for he was confident he could vanquish him in short order.