城门失火，殃及池鱼
chéng​mén​shī​huǒ, yāng​jí​chí​yú

collateral damage

城门失火，殃及池鱼 (城門失火，殃及池魚) chéng​mén​shī​huǒ, yāng​jí​chí​yú
collateral damage
innocent bystanders suffering as a result of a conflict or disaster involving others
interconnectedness
the idea that individuals or entities are linked such that a misfortune for one inevitably affects others; no man is an island

Sources
Definitions
CC-CEDICT