I have lost several attacks due to full set of units in the defending squad center. When I know I can't win, I do my best to take all those units out. I look at this way....if I am going down....you are not going to get use those units for your next defense.
1. IOS, Trash Heap, Rebels, Han's Scoundrels, HQ Lvl = 5
2. Windows 10, Trash_Heap, Empire, Squad Watto's Shop, HQ Lvl = 6
3. Windows 10, Big_Guy: Empire, HQ Lvl = 3