Why did Belgium get involved in ww1?

Answer 1

Germany chose to invade France through Belgium. That violation of Belgium's neutral rights brought Britain into the war. And the tiny Belgian army put up a fight, delaying the breakthrough to France and endangering the success of the Schlieffen Plan, to which Germany had bound itself.

Answer 2

During World War I, Belgium played a minor role as neutral victim, as combatant, and as minor member of the Triple Alliance. It was initially neutral until being invaded by Germany, at which point it became a formal combatant in the conflict. Although most of its territory was occupied by Germany throughout the war, its forces continued fighting on the side of the Triple Alliance until the war was won in 1918.

Answer 3

Because Germany invaded them under the Schliffen plan, why else?
Wouldn't you defend your homeland against an invasion?