The phrase "oncoming attack" refers to an imminent or approaching act of aggression or assault from someone or something. It means that an attack is about to happen soon. Full definition
You play as a commander who leads a ragtag team of specialists to defend these cities from oncoming attacks. (videochums.com)
But some believe that the dogs are perceptive enough to warn their owners of oncoming attacks, allowing the owners to take seizure - blocking medication, get to a safe place or call for assistance. (livescience.com)
While the moves are great at times, pulling them off can sometimes be a challenge, especially when dodging oncoming attacks. (averagexboxgamer.com)