狼煙

Noun

 * 1) smoke from the wolf dung burnt to signal warfare; fire beacon; smoke signal
 * 2)  war; flames of war

Etymology 1
The kanji spelling is an, supposedly derived from the use in China of wolves' droppings in signal fires.

Noun

 * 1) smoke signal, skyrocket, signal fire, beacon

Noun

 * 1) signal fire, beacon

Usage notes

 * The reading is more common.