On regular base page, the war map icon should display when someone is attacking
a green number reflecting how many current attacks would represent your clan, red numbers the enemy. Should be seen from the regular base page. Currently you cannot know if someone is attacking if you are working on your non war base.
For some reason I don't see it, but there had been a post suggesting arrows pointing so you know if enemy or ur clan was attacking but that's why the color system was mentioned. Green for your clan, red for the enemy. No arrows would be needed.