Street-fighting is a very big subject, and as a rule it gradually develops into underground warfare.
Villages entered during a battle often have snipers in the top stories or on the roofs of the houses, and these are places in which you may also place a few good shots with great advantage. This is an illustration of the advisability of doing to the enemy what you do not like his doing to you.
I will send you another problem next week.
Your affectionate father,
“X. Y. Z.”
LETTER IV
December 22, 1917.
My dear Dick,—