. . . This morning at 7 a.m. cries
of "the balloon is loose" and "look at her". . . startled most
of us at headquarters while crowds of soldiers came running from
all directions out of the woods to the front of the open plain
to see it sail gracefully away high in [the] air with two long
ropes dangling from the car or basket. It was going swiftly straight
for Yorktown. All had our conjectures as to what it was going
that way for. It rose two miles or more when about three quarters
way across the immense open ground in our front struck an upper
current of air and came slowly back to our lines in a slanting
direction and suddenly dropped down in the woods where Birney's
brigade were in camp. General Fitz John Porter after a while made
his appearance from that quarter, accompanied by three or four
officers of Birney's staff to report to General Heintzelman.
The balloon had been moved since
it had been fired on yesterday to his headquarters half a mile
or so back of the sawmill. The ropes being securely fastened to
a tree, Porter had ascended there yesterday to observe the enemy.
This morning he unloosed one rope which held the balloon leaving
one to hold it and tried to ascend again by himself. When the
balloon arose the rope broke and set him free. He had been up
with Lowe the balloonist many times before, but the idea of being
loose and sailing at such a swift rate through the air had confused
him, and he did not know how to manage a balloon either. It was
dead calm on the earth's surface, but the balloon moved very rapidly
nevertheless. As he passed over our heads, . . . we shouted "pull
the valve," but he did not heed or hear us. Lowe soon came up
on horseback and went after his balloon. . . . The Rebels would
have been delighted to have got the balloon with Fitz John in
it. We at headquarters did not care as long as they did not get
the balloon.
. . . The balloon rose to about
1600 feet [and] sailed across the plateau in our front and to
right over Yorktown. The general crouched down in the car as volleys
of rifle balls were fired at the balloon by the enemy as the car
descended lower down and directly over their works. Porter now
threw over all the sand bag ballast attached to the balloon, when
it rose quickly to a great height and striking an upper adverse
current came sailing slowly back to us again to the camps of Birney's
[brigade] below the sawmill. Porter, fearing that he would be
carried beyond to the James River unless he could descend, became
desperate, climbed out of the car and gave the valve line a hard
jerk, which opened the valve wide. It also made him lose his grip
on the ropes and he fell into the basket, one half of his body
hanging over the side with the balloon 2000 feet above the earth!
Porter now was aware that he had pulled the valve too wide as
the balloon now began to fall very rapidly and with a fearful
rush, he could not close the valve again for the rope was far
out of his reach away above his head in the netting. Even if he
had the strength to reach it, he could not climb up and get it.
The balloon now began to be as
limp as a rag and was tossing from side to side, but was descending
straight into the camp. Seeing a large tree beneath him he took
his chances for life by jumping into it, and in a second was hanging
in the branches by one arm and leg, completely enfolded by the
shattered balloon with the escaping gas filling his lungs at every
breath. Help was at hand, however, and he was rescued by the soldiers
of Birney's troops. The balloon was torn away, and he was lowered
to the ground in an exhausted condition. . . .
On investigating, it was found
that both ropes which held the balloon had become corroded by
contact with the acid wagon tops, by which the gas is manufactured,
and broke at the jerk when the balloon had got to the end of its
tether. New ropes were of course attached to it. General Porter
investigated the cause of the balloon ropes so suddenly snapping
off when he made the ascent, and found out that the sergeant who
had been detailed from the 50th New York engineer regiment had
had some hard words with his captain who had charge of the balloon
the evening previous. The sergeant, therefore, smeared the ropes
with acid from the gas making wagon, which ate the ropes so that
they broke like loose tow. As the captain generally made the ascent
at an early hour, . . . the sergeant thought it would be a good
thing for him to get loose once and go anywhere or nowhere. But
the captain was not on the ground until later, when General Porter
decided to go up alone. So he was carried off instead of the captain.