What is the xenia code of conduct in greek mythology?

The Xenia code of conduct in Greek mythology deals with conduct, hospitality and generosity between host and guess.

For  plato family .

Hosts should be courteous to guests, and guests should not be a burden upon the host

Explanation:

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.