Fifth civil war With Henri's return to France from Spain, he was keen to counteract the military influence that
Retz had accrued as a favourite of Catherine in the proceeding years. To this end Biron was appointed as a marshal. In response, Retz resigned his role of Constable that he had held in Henri's Polish administration. With civil war resumed in between the crown and the
politiques there was fear at court that
Condé, who was in Germany, would enter the kingdom with his forces. To prevent this, and allow the crown to focus on subduing
Damville in
Languedoc, Biron and the young
Guise were sent out to monitor the frontier. They arrived at
Langres with 8000 men. The king continued to send forces to
Langres to bolster the army, for the eventual crossing of Condé, which occurred in October, Guise leading the army that defeated them at
Dormans.
Informal war In January 1577 as France again found itself on the brink of civil war with the Huguenots at arms, Henri, little interested in a war that would leave him at the mercy of the
Ligue sent out envoys to the key Protestant aristocrats, hoping to bring them into line such that formal conflict could be averted. Biron was sent with a message to
Navarre, a mixture of reassurances about the crowns friendliness to him, and concerns about his actions. Navarre sent a contrite reply, but held several objections to the king's position, and another debate on the
conseil privé erupted over whether to go to war. With the peace faction winning, Biron was again sent to Navarre on 3 March to continue negotiations. While these were ongoing the military situation of his supporters deteriorated into war. Navarre maintained his desire for peace, and the two sides were able to come to terms in the
Treaty of Bergerac in September 1577. Navarre complained bitterly about Biron's role as lieutenant-general of Guyenne, bemoaning that he was governor in name only given how much authority his subordinate had. In February 1579 he resigned as lieutenant-general of
Saintonge and
Aunis in favour of the
sieur de Belleville. Biron, as lieutenant-general of Guyenne was responsible for overseeing some of the concessions granted to the Protestants in the
Treaty of Nérac, however he would not implement them all. As a result, the Protestants of the region began re-arming, and Navarre took the excuse to seize the town of
Cahors in May 1580. He took a brief leave in 1580 after he fell off a horse whilst campaigning at
Toulouse, and while recovering appointed his son
Charles to lead his forces.
Netherlands The king's younger brother
Alençon seeking advancement accepted the offer from
William the Silent to become sovereign of the
United Provinces of the Netherlands in 1579, entering the country in 1582. In 1581 with Spanish fears about what Alençon might be planning, Biron was sent to Picardy to guard the border in case Spain took the offensive. The following year Alençon now in the low countries was struggling to exert control his army depleted by the harsh winter. Biron and
Montpensier were tasked with reinforcing him. Biron arrived with 3500 foot and several companies of cavalry on 1 December 1582. He would grow restless and unsatisfied with the territories he ruled, and sought to surprise the city of
Antwerp to add it to his dominion. The attempt was a disaster, and his force was trapped in the city and destroyed during the
French Fury, Biron and Montpensier were uninvolved in his attempt on the city. Bellièvre was sent to the Netherlands to smooth things other with the States. He achieved great success and the States invited Biron to relieve the siege of
Eindhoven which was under attack by the Spanish. In April however Eindhoven capitulated and Biron moved his forces to
Roosendaal. Increasingly out of cash Biron begged for funds almost daily but without result, his army disintegrated from desertions before his eyes. Biron angrily blamed the estates for the failure of his expedition. Money was at last advanced from France to pay for the remnants of Biron's army to withdraw from the Netherlands. With the death of Alençon the following year, Biron accompanied his body back to Paris for the lavish funeral overseen by Henri.
Ligue Compelled by the
Ligue to make war on the
politiques in 1585, Henri tasked
Matignon and Biron with prosecuting the war against Navarre in Guyenne. The two Marshals prosecuted the campaign half heartedly, and only the forces directly loyal to the
Ligue under
Mercœur conducted the war with any vigour. Biron secretly negotiated with Navarre in July 1586 and in the following month a truce was established by the two. In 1587, with a German army invading in support of the Protestants under
Casimir a council was held by Henri to decide how to proceed. Henri announced to the assembled nobles his desire to lead the French army out to destroy the invader, explaining it would allow him to regain authority from the
Ligue. Biron and all the other councillors except
Nevers expressed their horror at this idea.
Day of the Barricades By 1588 the situation in Paris was tense, the
Ligue, increasingly dominant, orchestrated a coup in the city, with Guise at its head. Those out on the barricades threatened bloody violence on the loyalists, unless the royal and Swiss troops were removed from the city. Henri ordered the troops withdrawn to the
Louvre, and tasked
François d'O,
Jean VI d'Aumont and Biron with leading them off the streets. Small fights would break out however, and the lives of the Swiss were at risk from the crowd. The king sent Biron to meet with the duke of Guise, and Guise agreed to provide them passage to safety from the violent crowd. ==Reign of Henri IV==