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on les rencontre en force

Hi,all

I am not able to comprehend this phrase, could you give me some advice?

I've read such a sentence:" les cubistes, on les rencontre en force." There's another sentence ahead, it writes:"leurs oeuvres remplissent maintenant plusieurs salles et se manifestent dans plusieurs salons，puisqu‘ils font école."

So the author means the Cubist painters as a school, were gathered in large numbers? But I doubted it. What does "rencontre" mean here?

Thanks a lot!