How are you supposed to defend?
Is it correctly understood that if someone 20-30% stronger than you attacks, that you should just let him to some extent and hope he doesn't take too much or someone sees and counterattacks him? It seems attacking back to reduce his front to 0 often makes it worse, if they put the same amount back, and you keep doing the same, until you both get you reduce to 0% and him to 20-30% where he just steamrolls your entire country.