'But if you would know what I think set the beacons ablaze, it was the news that came that eve out of Lebennin. There is a great fleet drawing near to the mouths of Anduin, manned by the corsairs of Umbar in the South. They have long ceased to fear the might of Gondor, and they have allied them with the Enemy, and now make a heavy stroke in his cause. For this attack will draw off much of the help that we looked to have from Lebennin and Belfalas, where folk are hardy and numerous. All the more do our thoughts go north to Rohan; and the more glad are we for these tidings of victory that you bring.
'And yet' – he paused and stood up, and looked round, north, east, and south – 'the doings at Isengard should warn us that we are caught now in a great net and strategy. This is no longer a bickering at the fords, raiding from Ithilien and from Anórien, ambushing and pillaging. This is a great war long-planned, and we are but one piece in it, whatever pride may say. Things move in the far East beyond the Inland Sea, it is reported; and north in Mirkwood and beyond; and south in Harad. And now all realms shall be put to the test, to stand, or fall – under the Shadow.
'Yet, Master Peregrin, we have this honour: ever we bear the brunt of the chief hatred of the Dark Lord, for that hatred comes down out of the depths of time and over the deeps of the Sea. Here will the hammer-stroke fall hardest. And for that reason Mithrandir came hither in such haste. For if we fall, who shall stand? And, Master Peregrin, do you see any hope that we shall stand?'
The Return of the King, by J.R.R. Tolkien