On the night of the 12th-13th March, Henry occupied Saint Andre, a village situated on an elevated and extensive plain four leagues from Nonancourt, in the direction of Ivry, fringed on three sides by villages and by a wood, and commanding a view of all the approaches from the country between the Seine and Eure.  It would have been better had Mayenne been beforehand with him, as the sequel proved; but the duke was not famed for the rapidity of his movements.  During the greater part of the night, Henry was employed in distributing his orders for that conflict which was inevitable on the following day.  His army was drawn up according to a plan prepared by himself, and submitted to the most experienced of his generals for their approval.  He then personally visited every portion of the encampment, speaking words of encouragement to his soldiers, and perfecting his arrangements for the coming conflict.  Attended by Marshals d’Aumont and Biron he remained on horseback during a portion of the night, having ordered his officers to their tents and reconnoitred as well as he could the position of the enemy.  Towards morning he retired to his headquarters at Fourainville, where he threw himself half-dressed on his truckle bed, and although the night was bitterly cold, with no covering but his cloak.  He was startled from his slumber before the dawn by a movement of lights in the enemy’s camp, and he sprang to his feet supposing that the duke was stealing a march upon him despite all his precautions.  The alarm proved to be a false one, but Henry lost no time in ordering his battle.  His cavalry he divided in seven troops or squadrons.  The first, forming the left wing, was a body of three hundred under Marshal d’Aumont, supported by two regiments of French infantry.  Next, separated by a short interval, was another troop of three hundred under the Duke of Montpensier, supported by two other regiments of foot, one Swiss and one German.  In front of Montpensier was Baron Biron the younger, at the head of still another body of three hundred.  Two troops of cuirassiers, each four hundred strong, were on Biron’s left, the one commanded by the Grand Prior of France, Charles d’Angouleme, the other by Monsieur de Givry.  Between the Prior and Givry were six pieces of heavy artillery, while the battalia, formed of eight hundred horse in six squadrons, was commanded by the king in person, and covered on both sides by English and Swiss infantry, amounting to some four thousand in all.  The right wing was under the charge of old Marshal Biron, and comprised three troops of horse, numbering one hundred and fifty each, two companies of German riders, and four regiments of French infantry.  These numbers, which are probably given with as much accuracy as can be obtained, show a force of about three thousand horse and twelve thousand foot.