The battle of Valar against Melkor was called, The War for Sake of the Elves or the War of the Powers. [1] They fought it during the Year of the Trees, to rescue the Elves and to suppress the power of Melkor.
But Melkor was so cunning that he came to know of their arrival through moles. He captured the Elves, who were roaming in the lands far away from theirs. They ushered elves to the citadel of Angband and Utumno. Melkor tortured them with the aid of orcs, the servants he bred especially for the war. He showed his hatred for Eru and also his superior power to form life and vented off his anger on the Elves. After a few years, Valar Orome came across the Elves, who were still free on their hunting journey to middle-earth. On their meet, he realized it was the elves for real. So, he suggested he would take them to Valinor to offer protection to them. Although few of them gave consent, a few didn't' trust him. They were doubting him as a kidnapper. Orome reached back to Valinor taking the elves who agreed to come with him. They, thus, came to know about the orcs. They felt that this creation was an offense that was so outrageous. Manwe and the other Valar could no longer stand it and immediately sought the counsel of each other. They decided it was time they rescued the middle-earth from the crushing hands of Melkor.
The Chronicle
The Onset of the War
Melkor wrecked the two sources of light before the Sun's rise. It led to the reshaping of Arda from its original form. After that, the Valar left the wreck to an additionally formed continent Aman, where they erected the Valinor. In the meantime, Melkor continued his reign in the reformed continent of middle-earth. He influenced the beasts that survived among the ruins, turning them evil. The Valar was hesitant to approach Melkor. They didn't know the changes happening in middle-earth, and they feared that their interference would bring another rampage, as the destruction of the two-lights. They aimed to safeguard the actual plan of making, but they doubted how much they can retrieve. After this calamity, they didn't believe that the Elves and the men would come into existence. To their surprise, the Elves arrived at middle-earth, in a place near Cuivienen. The Valar, who was away from the lands of Arda, was not aware of it.But Melkor was so cunning that he came to know of their arrival through moles. He captured the Elves, who were roaming in the lands far away from theirs. They ushered elves to the citadel of Angband and Utumno. Melkor tortured them with the aid of orcs, the servants he bred especially for the war. He showed his hatred for Eru and also his superior power to form life and vented off his anger on the Elves. After a few years, Valar Orome came across the Elves, who were still free on their hunting journey to middle-earth. On their meet, he realized it was the elves for real. So, he suggested he would take them to Valinor to offer protection to them. Although few of them gave consent, a few didn't' trust him. They were doubting him as a kidnapper. Orome reached back to Valinor taking the elves who agreed to come with him. They, thus, came to know about the orcs. They felt that this creation was an offense that was so outrageous. Manwe and the other Valar could no longer stand it and immediately sought the counsel of each other. They decided it was time they rescued the middle-earth from the crushing hands of Melkor.