Ancient Greek-citizen soldiers who fought together in a phalanx were called Hoplites.
Hoplites were not professional soldiers but they comprised the bulk of ancient Greek armies of the time. They were mostly represented by free citizens such as propertied farmers and artisans who could afford the weapons and armors. Hoplites were primarily armed with shields and spears and often utilized the phalanx formation as an effective war strategy especially when battling with fewer soldiers.
The illustration below shows an example of a phalanx formation (Source: http://www.ancientgreekbattles.net/Pics/669505_PhalArgos.jpg).
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The Allies learned their lesson from WWI by not punishing Germany too harshly. Instead, they focused on rebuilding Germany's infrastructure and economy and they also wanted to create the United Nations to be able to sort out conflicts between nations to prevent another war from happening
It's important to know the difference between an alliance and an entente in order to answer this question.
alliance means that when one enters a war, every ally of that country enters as well. entente means that when one enters a war, others are not required to.
the Triple Alliance meant that once war started for Austria-Hungary, war also began for the Allied German States and Italy.
however, although Serbia (where the Alliance was attacking) was "friends" with the entente, it was not a member of the Triple Entente--and because as an entente they were not required to fight for one another anyway--it was up to France, Britain, and Russia had the option to join or not.
but all ended up joining because, to put it jokingly, "their friends are fighting our friends!"