Belgium and it's army is often overlooked when WW1 is discussed.
It was a tiny army, even by BEF standards, and the BEF was tiny in comparison to the armies of it's French Allies and German foes.
German forces invaded Belgium expecting
an easy passage and their timetable to knock France out of the war before turning east and engaging Russia depended on it.
At Liege the belgians put up stiff, but eventually futile, resistance. However it did dent the precious timetable adding
more precious days in which the battered French army could regroup.
They then held out at Antwerp, finally at Nieuwport where, seeing that the coastal advance of German forces was unstoppable, they took the decision of closing the sluices of the River
Yser and flooding the land known as the polders, a low lying strip of reclaimed land.