When I read that scripture I didn't get that impression, from what I read in the King James Version is this:
"AndI saw the beast (the antichrist), and the kings of the earth, and their armies, gathered together to make war against him that sat on the horse AND against his army." Rev 19:19
That tells me the antichrist and his kings and their army are gathered together ready to fight against Jesus and HIS army. Jesus is NOT alone, but has the army of heaven ready at his side to fight against the antichrist and his minions.
As I continue to read down to verse 20, the antichrist and the false prophet are both taken and will be cast alive into the lake of fire and brimstone, verse 21 goes on to tell us that after that, the rest of the antichrists' army were slain with the sword of him that sat upon the horse, which "sword" proceeded out of his mouth; (the word of God is sharper than any two edged sword) and the flesh eating birds then got full with eating their dead bodies.
Now, for me, I do not feel Jesus will be alone. He will be sitting high upon a white horse and we can rest assured that a host of angels in Heaven will be with Jesus as well as the ones who died in Christ. We will make war against the antichrist and defeat him and his army.