Avengers of Tantura

When the Hunal space fleet lands on the world of Tantura in search depleted metals and minerals in their own world, they receive quite a surprise. The supposedly docile inhabitants, rather than submit, fight them literally to death when they try to enslave them in order to extract the abundant mineral deposits. It takes the militarily untrained two years of ferocious fighting to defeat the enemy.

Book II in the Avengers of Tantura series. As the Tanturans had anticipated would happen, it took the second Hunal fleet to arrive three years after the destruction of the first one. This new force was much larger and was commanded by the Hunal queen herself. As the new threat approached, the Tanturans ambushed them and, lead by their Earthly human generals, they defeated them resoundingly.

Book III in the series of Avengers of Tantura. Two years after they annihilated the Hunal, the human expats on Tantura receive the terrible news that the Yellowstone Caldera on Earth is about to explode and that it will destroy the entire planet. Wishing to save as many of Earth's inhabitants, the Tanturans evacuate millions of them to the now empty verdant world they had taken from the Hunal.