The Peloponnesian war was an ancient Greek war fought by Athens and its empire against the Peloponnesian league led by Sparta (431 - 404 BC)
Under the leadership of Sparta they declared war on Athens
Austria-Hungary, declared war on Serbia
Yes it can.
Poland was invaded by Germany just before the war was declared.
China
Spain
europe
Siberia is a region of Russia, not a country. Australia has never declared war on, or been at war with either the USSR or Russia.
Austria-Hungary declared war on Serbia at the start of World War I.
England
Austria
The Peloponnesian War began when Sparta declared war on Athens in 431 BCE. This conflict arose from escalating tensions between the two powerful city-states, primarily over issues of power, influence, and territorial disputes. The war lasted for nearly three decades, fundamentally altering the balance of power in ancient Greece and leading to significant social and political changes. Ultimately, it resulted in the decline of Athenian dominance and the rise of Sparta as a leading power.