Greetings CainHarmbank,
Below is the scripture in question:
"Then I saw an angel standing in the sun, and he cried out in a loud voice to all the birds flying overhead, “Come, gather together for the great supper of God, so that you may eat the flesh of kings and commanders and mighty men, of horses and riders, of all men slave and free, small and great.” - Rev.19:17-18
Rev.19:11-21 is a detailed account of the second coming, i.e. Christ's return to the earth to end the age and establish his millennial kingdom. As the Lord is returning, an angel will be gathering all the birds of the air for the supper of the great God, which is referring to when all of those kings and their armies will be killed by that double-edged sword, which is figurative representing the word of God. At that time "the birds" will eat the flesh of those killed as revealed in Rev.19:21. In your original post, you have the angels eating the flesh of those killed, which is false. The birds that the angel will have gathered are those who will eat their flesh.
I hope that this clears things up.