It was actually a very intelligent move to send troops up North, while the main attack took place in the South. Sauron knew that if left to their own devices, the Lonely Mountain and Mirkwood would probably send some form of aid to the South, and he didn't want that to happen. The forces that he sent North kept those viable armies occupied, and prevented a great deal of aid from being sent. Legolas probably realized that when he told Gimli that there was no need for their kindred to march to the war, for war was already upon them.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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