Oddly enough, the first great wave of Muslim “migrants” entering Europe via Spain and then France seemed unstoppable too - until Charles Martel at the Battle of Tours in 732 AD. The second great wave of Muslim “migrants” entering Europe via Greece, Serbia, and then Hungary seemed unstoppable too - until the Siege of Vienna in 1529. This wave of violent military-age male “migrants” can be stopped too; it just takes a willingness to defend our wives, our children, and our homes.
The descendants of the heros who stopped the Muslim hordes at Tours and Vienna died in the mud of Verdun and the Somme and a hundred other hellholes of the Great War.
That war killed, on average, 10,000 men a day, seven days a week, for over four years.
Europe never recovered from that one.