Britain was the world’s greatest sea power (although the Germans were certainly challenging that claim at the time). They could have filled several of their navy’s ships with a few thousand British troops to be transported to the Adriatic, taking them just a short distance from Serbia. Maybe they could have sent some other ships into the Bosporus, roughly flanking landlocked Serbia from either side. This would have served several potentially advantageous purposes. It is very much, in game-theory lingo, a costly signal. Talk is cheap, but sending a fleet into a prospective combat zone is
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