Notes

War Strategy Guide to Club LONDON - SimCity BuildIt

1) Attack: start with the opponents with the lowest score! But unless you don't have a choice, do not destroy the opponent completely. Bring them down to 1/11 if possible and LET THEM REPAIR!
EXPLANATION: it is less important to put cities under shield, since a SimCity update that left the players only 5 minutes to change the required items to repair a building - this makes it very easy to get out from the shield. It is FAR MORE IMPORTANT for us to be able to score, and we can't score on a city that is under shield. This is more and more important, when there are only a few cities left to attack. Repair = more scores to get.

2) The case when there are only a few cities left to attack: if you have a spell that makes 8+ damage, use it, once the opponent has 1/11 life. This way you will MAXIMALIZE the achievable score on one city. We can do 10+10 damage on an 11/11 city (even if it doesn't repair), so make sure, you are attacking effectively!

3) Avoid using Not in Kansas and Tentacle Vortex spells - these are a waste of your energy! If you have the chance to use Magnetism or Building Portal, use them - these are energy savers (can be compared to a level 4 spell).

4) If the enemy club is strong, and the war scores are tied between the two clubs (especially when we have less score), the most important strategy is: DO NOT REPAIR yourself, when you are attacked, UNLESS you are under shield! BUT don't get out from the shield, unless you gained back your 12 energy!
EXPLANATION part 1: if you don't repair yourself, the enemy can't score more on you. The enemy can destroy you by scoring only 1100 (or if they are smart, more with higher level spells), but as mentioned before, you can score 1200 or even much more with maximalizing your attack. We assume here that the enemy is not that smart, and we can beat them by simply following this strategy and collecting 100+ score difference each "round". It is usually working!
EXPLANATION part 2: you need to wait to gain 12 energy under shield, because if you come out earlier, you can get simply attacked again, providing more scores to the enemy. The whole point is to minimalize enemy scores on your city and maximalize yours on them.

5) If the scores are very tight between the two clubs, BUT we are IN THE LEAD, and ALL of our cities are UNDER SHIELD... we need to discuss in the club chat that we ALL STAY UNDER SHIELD until the end of the game... or we risk losing the war to earn more scores for the war chests.

That's it. We might improvize too, so read the club chat for updates!