To Win or Lose It All. Conquistadors!, #3

The Protectorate - an interdimensional empire that has conquered five timelines so far - has set its sights on ours. Led by a man willing to risk everything for power and conquest, armed with technology a hundred years ahead of ours - technology promising salvation to its allies and doom to its enemies - and drawing on a far deeper military history, the Protectorate Expeditionary Force has arrived to invade and incorporate our world into the greatest empire the multiverse has ever known, or die trying.
The war between the United States and the Protectorate has stalemated, with both sides reeling from their wounds, but neither one can afford to abandon the war. With the odds tipping against him, Captain-General Montrose embarks on a desperate plan to bring the United States to its knees, expanding the war across the world in a final desperate bid for glory. And as both sides move towards a final cataclysmic confrontation, with the fate of the entire world in the balance, they know that only one side can win ...
And the other will lose it all.