The point of forming alliances was to prevent war by deterrence but, if war did happen a countries allies job was to help them win the war. The problem with this is that if any country got into any type of conflict then everyone and the alliance system would also get into conflict. Which is why many countries had many conflicts with each other because of the alliances which also proves how alliances is an important cause to world war 1.
An alliance is an agreement made between two or more countries to give