11 h 17 m, 28 jul 1914 ano - World War I Begins

Descrição:

Serbia mobilized their army because they thought Austria-Hungary was getting ready for war. Serbia went to Russia for assistance and Austria-Hungary declared war on Serbia.

The start of the first World War shows that many countries can get involved quickly because there are alliances between countries.

Adicionado na linha do tempo:

Data:

Imagens: