I logged on and cleared raid screen. While online, i got 3 seperate pop ups from being attacked. Took a few minutes. I suppose it is possible that the last one or two were longer battles and they all started right before i logged in, but just seemed odd.
That happens frequently for the exact reason you mentioned. Usually those attacks while online come within a few minutes of signing on 
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First time I’ve ever had three. I won the last so I’m guesding they timed out lol