Clash-of-clans – Attack not being counted in clan war

It is a bit weird at first - the destruction of your base only yields a hunk of your resources being stolen. Repairing your base takes only a few seconds and costs very little.

The overall goal in the game is pretty murky. There are ever-increasing base upgrade goals to be met, which you will gain either by waiting for your own resources to collect, or more quickly by raiding other people's bases. Pride in your town's strength and building levels could thus be considered a major goal of the game.

However, I would argue that the overall goal is to rank highly in the player-vs-player leagues, which require you to amass tons of trophies by successfully attacking other bases or defending your own.

Whatever the highest level your buildings are before the end of the preparation day is the level of those buildings during the war. Anything under construction in your "normal" base will revert to the level it was before you started the upgrade in your "war" base.

This is from the Clan Wars FAQ, written by a SuperCell employee:

The war base can not be directly upgraded or rearranged, but will instead mimic the arrangement and highest completed upgrade levels of your village during the preparation day. Buildings and traps will never be “under construction” in your war base.