In 1616 the Venetian Republicdeclared war on the Archduke of Styria, of Inner Austria. Early on, Venice addressed the Netherlands for support, whether in money, troops or ships, as the transportation of goods across the Alps to Venice was denied for years. Jan Ernst served in late September 1616 when the resident Suriano and got a contract for six months. The preparations lasted a month, but the Amsterdam shipowners argued excessive demands on the rental of twelve ships, so Jan Ernst emigrated to Enkhuizen and Rotterdam. Half way through November all ships were ready, but partly because of the unfavorable winds and storms, the ships were unable to leave for three months. Meanwhile, mutiny broke out on the ships in Schiedam. Johan Ernst had serious problems with paying an advance on the pay as from the date of appointment and not from the date of exit. The inhabitants of Texel demanded money for all sailors who were housed by the island population. Johan Ernst lost his courage, because the Venetians would only pay when the soldiers arrived. The captains had stashed food reserves for a period of three months and after a short period of time the sailors had already consumed 2,5 months supplies. The owners of the ships were increasing claims on Johan Ernst. It seemed that they would not get the profits which they had reckoned with, and they threatened to leave. The terrible boredom and frightening rumor that the Republic of Venice was about to negotiate peace, but also illness, expensiveness, mutual fights played a disastrous role in that year. Only on March 2, 1617 the troops left the Texel, a ship stranded off the coast, the rest came on April 4 in the lagoon of Venice. Johan Ernst was granted the rank and title of General by the Doge of Venice, Giovanni Bembo. John Ernst of Nassau came with his 3,100 men, including his brother William and Joachim Ernst of Schleswig-Holstein, for Gradisca d'Isonzo, a small but powerful Habsburg city in the county of Gorizia and Gradisca, on the River Isonzo. For the past18 months, the city had been in the hands of the Venetians, under the command of Giovanni de 'Medici. Initially, two enemy forts were taken by the Dutch, but because of dissension, John Ernst of Nassau requested his resignation in late July. Prince Maurice insisted, however, to remain at his post. Then, September 26, 1617 the Peace of Madrid was concluded and the siege was abandoned.
Death
Jan Ernst had already contracted dysentery and died in Udine, because he had never recovered from this terrible disease. The corpse was embalmed, but the ecclesiastical authorities do not have permission to bury him on the spot. His Protestant background proved too strong, in fact, even if Johan Ernst wanted to be buried at Arnhem, it seems to have been buried in Siegen. Shortly before his death he ordered the owners to pay various debts and the remaining amount of about 80,000 florins. The troops of many other leading Dutch were reduced in a short time. The war of Uskok and developments in Bohemia, where he was deposed Wren, has led to the Thirty Years War.
