When the supports attached to Tushin’s battery had been moved away in the middle of the action by someone’s order, the battery had continued firing and was only not captured by the French because the enemy could not surmise that anyone could have the effrontery to continue firing from four quite undefended guns.
There are no more uses of "effrontery" in the book.
Show samples from other sources
She had the effrontery to laugh at the mayor’s request.
Armed with too much confidence and effrontery, she made a lot of enemies.