The lines continued to fold in France as the Germans and their allies continued to march forward with overwhelming momentum and power. Like a thunder strike, they march and they marched, obliterating every enemy position in their path.
With the nation's shores blockaded by the Navies of the Central Powers, there was really only one way to escape the chaos, through the Pyrenees into Spain. A treacherous journey, which thousands or perhaps even millions had opted to take.
Of course, when the first few thousand illegal French migrants made their way to Spain, nobody truly batted an eye. But when the numbers became far more troublesome, the Kingdom of Spain sent its army to the borders to stem the tide of would be refugees who would overwhelm an already unstable and chaotic system.