How has the geography of afghanistan made it difficult for invading armies to conquer?

Afghanistan geographical condition made it difficult for the invading armies to conquer. If we look back at history British were unable to conquer the land. Soviet in the Afghan War and the United States since 2001 powerless to conquer the country because of its terrain. The high mountains and deserts cover Afghanistan as far as the eye can see made the invading armies to capture impossible.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.