Fort Casimir - Sovereignty

Sovereignty

The fort changed hands several times.

Shortly after his arrival to take up his position as up as Director-General of New Netherland in 1648, Peter Stuyvesant, attempted to re-assert control of the region and its lucrative trade. In his initial attempt at control, he effected the construction of Fort Beversreede near the terminus of the Great Minquas Path, at the mouth of the Schuylkill. The location of earlier-built Fort Nassau on the east bank (now New Jersey) of the river, had proved disadvantageous since the richest fur-trapping area of the native Susquehannock and Lenape populations was inland to the west. In 1651, Stuyvesant had the fort dismantled and relocated to the western bank downstream from Fort Christina, the first and one of the larger Swedish settlements. He named it Fort Casimir. Fort Beversreede was abandoned and the Dutch presence was consolidated.

On Trinity Sunday in 1654, Johan Risingh, Commissary and Councilor to New Sweden Governor Lt. Col. Johan Printz, officially assumed his duties and his attempts to expel the Dutch from the Delaware Valley. Fort Casimir surrendered to the Swedes and was renamed Fort Trinity (in Swedish Fort Trefaldighet). On June 21, 1654, the native peoples met with the Swedes to reaffirm their alliance.

Stuyvesant led a Dutch force which retook the fort on September 11, 1655, renaming it New Amstel (in Dutch Nieuw Amstel). Fort Christina, located 6.5 mi (10.5 km) to the north fell on September 15, 1655. Fort Nya Elfsborg, on the east bank, was abandoned and set afire by departing Swedish forces. New Sweden came under the control of the Dutch. John Paul Jacquet was immediately appointed Governor, making New Amstel a regional capitol of the Dutch province, subordinate to New Amsterdam. It is generally assumed the Peach Tree War attack at Pavonia was a retaliation, as the indigenous population considered the treaty with the Swedes to include a defence alliance.

In 1664, Stuyvesant peacefully surrendered control of Fort Amsterdam, and thereby, all of New Netherland to the British. Proceeding south the British peacefully took Fort Altena. A symbolic resistance was offered at Fort Casimir, but the fort quickly succumbed. In 1673-1674 it came under Dutch control again, but reverted to the English after the signing of the Treaty of Westminster.

The fort was abandoned around 1675 and the site was used for several different commercial purposes. Low laying areas around the old fort site were filled with ash. It is believed that presently a parking lot and several houses are located above the remains of the fort. A preliminary archeological survey of the area was conducted in 1986.