Death of General Leopold von Gilza. Colonel LEOPOLD VON GILZA, Acting Brigadier-General and Major-General during the late war, expired yesterday morning at an early hour, at his residence, No. 226 East Twenty-first- street. He was born at Erfurt Aug. 15, 1824, his father being Captain the Baron VON GILZA, a prominent officer in the Prussian army. In his 17th year his son had gained his epaulets in the same service. During the Schleswig-Holstein rebellion, in 1848, he commanded the vanguard with considerable distinction, and was decorated on the field for his gallant conduct. He also did good service during the Polish insurrection. In the Spring of 1861 he organized the De Kalb Regiment in this City, which he commanded un- til the expiration of its term of service. He was a thorough disciplinarian, and was almost idolized by his men for his fairness and courage. He was twice wounded in action. His health was completely broken by his military ca- reer in this country, the miasmas of Folly Island, South Carolina, having induced great de- bility, which was aggravated by a dropsical at- tack which set in a month ago. The funeral will take place from his residence to-morrow, at 2 o'clock, at which the Fifth Regi- ment will probably assist, as also Colonel GLANZ, of Pennsylvania.