which might be drawn out on the approach of danger.

Against these vessels, and some stores collected at Bordentown, an
expedition was planned which ended in their total destruction. General
Dickenson was in the neighbourhood, but his force was too small to
interrupt the execution of the design; and General Maxwell, who had
been ordered to his assistance, was retarded in his march by a heavy
rain, which did not obstruct the movement of the British, who passed
up the river in vessels.

[Sidenote: May 18.]

To cover the country more effectually on the north of the Schuylkill,
to form an advance guard for the security of the main army, and to be
in readiness to annoy the rear of the enemy, should he evacuate
Philadelphia, an event believed to be in contemplation, General
Washington detached the Marquis de Lafayette, with more than two
thousand choice troops, to take post near the lines. As this corps
formed a very valuable part of the army, the Commander-in-chief
recommended in his instructions to General Lafayette the utmost
attention to its safety; and, particularly, to avoid any permanent
station, as a long continuance in one position would facilitate the
execution of measures which might be concerted against him.

[Sidenote: Attempt on Lafayette at Barren Hill.]

The Marquis crossed the Schuylkill and took post near Barren Hill
church, eight or ten miles in front of the army. Immediate notice[2]
of his arrival was given to Sir William Howe, who reconnoitred his
position, and formed a plan to surprise and cut him off.