Too big to be extinguished at once, the forest fires at best could be contained|quench the flames|snuff out the candles
quench :suppress or crush completely
squelch any sign of dissent|quench a rebellion
quench :cool (hot metal) by plunging into cold water or other liquid
quench steel
quench :electronics: suppress (sparking) when the current is cut off in an inductive circuit, or suppress (an oscillation or discharge) in a component or device
quench :reduce the degree of (luminescence or phosphorescence) in (excited molecules or a material) by adding a suitable substance