What is the main idea of this quote? *

HAVING DEFENDED FORT SUMTER FOR THIRTY HOURS
UNTIL THE QUARTERS WERE ENTIRELY BURNED THE MAIN GATES DESTROYED
BY FIRE. THE GORGE WALLS SERIOUSLY INJURED. THE MAGAZINE SURROUNDED
BY FLAMES AND IT'S CLOSED FROM THE EFFECTS OF HEAT.
FOUR BARRELLS AND THREE CARTRIDGES OF POWDER ONLY BEING AVAILABLE
AND NO PROVISIONS REMAINING.
I ACCEPT TERMS OF EVACUATION OFFERED BY GENERAL BEAUREGARD BEING
ON SAME OFFERED BY PRIOR TO THE COMMENCEMENT OF HOSTILITIES AND
MARCHEDOUT OF THE FORT SUNDAY AFTERNOON THE FOURTEENTH.
WITHCOLORS FLYING AND DRUNMS BEATING.
BRINGING AWAY COMPANY AND PRIVATE PROPERTY AND SALUTING MY FLAG
WITH FIFTY GUNS. ROBERT ANDERSON. MAJOR FIRST ARTILLERY. COMMANDING.
Telegram from Union Commander Robert Anderson Announcing the
Surrender of Ft. Sumter, April 13, 1861.