Meanings

evil

root of an evil

cause of trouble

fortune and misfortune

source of misfortune

flood devastation

disaster

calamity

careless remark

war damage

White Peril (i.e. takeover by white race(s))

ravages of war

traffic disaster

traffic accident

troubles brought on by what one has written

harmful side effects of a medicine or drug

the Red Peril

flood disaster

to strike at the root of an evil

Yellow Peril (alleged threat to Western civilization posed by East Asians)