Sometimes it's too easy

So there I was, looking up some facts about the Battle of Kohima (where my grandfather fought in 1944). A comment by Field Marshal Slim was made to the effect that Kohima, which finally turned back the Japanese from India, was similar in importance to Thermopylae, where the might of Persia was turned back from Europe in 480 BC.

One click of the mouse later, and I'm reminded that the pass at Thermopylae was held against 40,000 Persians by a mere 300 Spartans, 700 Greeks and ...

... 600 Thespians.

Insert your own punchline here.