This is reminiscent of the book series A Time Odyssey, by Stephen Baxter and Arthur C. Clarke, where a UN helicopter crew and a couple of cosmonauts from 2037,

This is reminiscent of the book series A Time Odyssey, by Stephen Baxter and Arthur C. Clarke, where a UN helicopter crew and a couple of cosmonauts from 2037, a late 19th century British force, the Mongol horde under Genghis Khan, Alexander the Great's army and a couple of early hominids happen to meet each other. I remember it as a quite interesting parallel to A Space Odyssey. Highly recommended.