'That you would attack treacherously, like an assassin in the dark.'

However, it turns out that the Poles were merely holding back so that they could treacherously attack the Cossacks after they won the battle for them.

When the Maratha camp under Madhavrao was relaxed and unsuspecting of a battle, they were caught unawared as Raghunathrao attacked treacherously.

He had another encounter with the wild-dog, who treacherously attacked him in flank from ambuscade.

It was you who treacherously attacked our home.

It was Spitz, treacherously attacking from the side.

According to the French, the Vietnamese spun out the negotiations to win time to assemble a fleet, and then treacherously attacked the two French warships without warning.

Or did he treacherously attack her?

But when he came upon Artabanus and his court, Caracalla treacherously attacked and slew many of them.

Soon after, Japan treacherously attacked us at Pearl Harbor.