Battle of the Marne WW1 Watch

Is this GCSE or A level?

This is a wider overview to let you see how it fits in with the war and the Schlieffen plan.
https://www.youtube.com/watch?v=7AOOlxbZN3E


This is a bit more detailed
https://www.youtube.com/watch?v=sbOdF-5dk_E
It is important you see the wider picture and how it all fits in.

https://www.youtube.com/watch?v=lHeMPV5VDR4&t=510s

This is just about the battle and only 2 mins.
https://www.youtube.com/watch?v=r1gqXlkJpXU

Watch all 3.

They explain why they happened.
Basically an opportunity to check and counterattack against the German advance, which was following the Schlieffen plan and had the Allies on the run. Until that point the war was mobile and it looked like Germany could knock the French out of the war, thus avoiding a continued war on two fronts.

The Germans were attacked in the flank which caused them to stop advancing and they were pushed back.
The Allied attacks caused a gap to appear in between two German armies and the British advanced through this gap forcing the Germans to retreat. The Germans then started to dig themselves in and that was the start of trench warfare with armies unable to make rapid advances anymore because both sides were too well dug in.That became the state of war for the rest of the conflict. Trenches were very hard to breakthrough.