What the colors on the war attacks mean:

Purple is if they didn't attack.
Green is if they hit the max amount of stars (3-starred in a win war, or 2-starred in a lose war) on their mirror. This is most likely good.
Violet is if they hit the max amount of stars (see definition above) on an opponent who isn't their mirror. This may be cleanup, or it also may be star stealing. Could be good or bad.
Red is if they 3-starred in a lose war, which is probably overstarring.
Cyan is anything that doesn't match the above, which means understarring - hitting 1 star on anything, or 2 stars on anything in a win war. Probably loot hits, could be understarring or cleanup or any number of things.

The leagues shown are the leagues of the clans at the time of the war, not necessarily the current leagues of each clan.