How many soliders lives were estimated to have
been lost?

20 million soldiers

Explanation:

around 20 million soldiers lost their lives during world war 1(Jul 28, 1914 – Nov 11, 1918). Most of the casualties came from Russia

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."