The slower moving heavy forces could then either seize objectives or pursue at leisure. However, with the advent of armoured warfare and "blitzkrieg" style operations, an enemy army could be kept more or less in a routed or disorganized state for days or weeks on end. In modern times, a routed formation will often cause a complete breakdown in the entire front, enabling the organized foe to attain a quick and decisive victory in the campaign. In the blitzkrieg warfare that characterized World War II, the French Army was decisively defeated in the Battle of Sedan (1940) opening a gap in Allied lines into which Heinz Guderian poured his mechanized forces. German tanks kept the rout going, and the Allies were unable to stabilize the situation before the Wehrmacht occupied Paris and forced the capitulation of the French government. Feigned routs may be used as a military deception to entice an enemy into pursuing the "retreating" force, with the intent of causing the enemy to abandon a strong defensive position or leading the enemy into an ambush. This carries some risk because a feigned rout can quickly turn into a real one. It was a favourite tactic of the Vikings and it is thought that Norman cavalry successfully performed a feigned rout at the Battle of Hastings. In the Battle of Cowpens, Daniel Morgan's planned retreat of the unreliable forward militia was interpreted by the British commander Banastre Tarleton as a rout, as intended. In over-aggressively pressing the attack, the British lost cohesion and were overwhelmingly defeated in the resulting double envelopment by the Americans. This feigned rout tactic had several benefits: it was a ruse de guerre that played off British expectations that an undisciplined militia would rout on contact, creating British overconfidence; the militia screened the main American force from the British view; and by asking for only two volleys before the retreat Morgan set an achievable goal for shaky and poorly trained militia facing British regulars, as well as allowing the militia units to remain intact for later parts of the battle. Leading up to the French decisive victory at the Battle of Austerlitz, Napoleon ordered his forces to retreat. Desperate to lure the Allies into battle, Napoleon gave every indication in the days preceding the engagement that the French army was surrendering, even abandoning the dominant Pratzen Heights near Austerlitz. In Georgian England a "rout" or rout-party was a relatively informal party given by the well-off, to which large numbers of people were invited.