It might be easy to lose track of which units have taken a test for being charged by chariots.
My rough idea is to place a token beside each unit that may have to take a cohesion test when charged by chariots and then remove the token if the test is passed.
I was originally planning to use tokens with wording on them - but what words without the token becoming gigantic ? My current thought is a simple token with a question-mark upon it.
Who sells a suitable question-mark token?
Does anyone have a better idea?