The enemy advancing rapidly by the road opposite the left of the line, the artillery played on him with effect; and as he came nearer, the musketry began to fire also. This having obliged him to fall back, he next directed his attack against the detached Kentuckians on our right, one column moving toward the wood and the other toward the centre of the line. Now was felt the effect of the bad position that we occupied. One of the enemy's columns turned our troops at the extremity of Colonel Davis' command, while the other penetrated into the unguarded space between the Kentuckians and the breastwork of the Louisianians. Flanked at both extremes by four times their own number, and unsupported, the Kentucky militia, after firing several volleys, gave way; nor was it possible again to rally them. Confidence had vanished, and with it all spirit of resistance. If instead of extending over so much space, those troops had been formed in close column, the confusion that took place might have been avoided, and a retreat in good order made. The enemy having turned our right, pushed on towards the rear of our left, which continued firing as long as possible. At length the cannon were spiked just as the enemy arrived on the bank of the canal. Commodore Patterson had kept up an artillery fire on the British over the river. As they advanced up the road, he would now have turned his cannon in their embrasures, and fired on those of the enemy who had turned our line and come in range. But the Kentucky troops and the Louisianians masked the guns, and made it impossible to fire without killing our own men. Seeing this, he determined to spike his guns and retreat. The Louisiana militia under General Morgan now fell back and took a position on the Bois Gervais line, where a number of the fleeing troops rallied. A small detachment of the enemy advanced as far as Cazelards, but retired before evening. In the course of the night all the enemy's troops recrossed the river, to join their main body. The result of this attack of the enemy on the right bank was, the loss of one hundred and twenty of his men, killed and wounded. The commander-in-chief, receiving intelligence of the retreat of our troops on the right bank, ordered General Humbert, formerly of the French army, who had tendered his services as a volunteer, to cross over with a reinforcement of four hundred men, assume command, and repulse the enemy, cost what it might. The order was verbal; some dispute having arisen over the question of military precedence, and the enemy withdrawing, no further steps were taken. "THE KENTUCKIANS INGLORIOUSLY FLED"--A PROFOUND SENSATION.