The final break came after the Day of the Barricades in which the king was forced to flee Paris. Taking charge in the capital, Guise instructed La Châtre to reach out to the great noble Nevers promising him a prominent place in a new government. La Châtre highlighted the power that Ėpernon had over the king, and implied a solution to this. He continued to play on this theme in letters to Nevers, writing in June that rumours the king had dismissed Épernon were false, and that only the ligue could solve the government. Henri meanwhile set about arranging for the duke of Guise's assassination, which was executed in December 1588. In response to the murder of the Catholic 'hero', many French cities defected from the crown once more, La Châtre initially wrote to the king assuring him of his continued loyalty, before in April of the next year, declaring himself in rebellion against a king who had 'allied himself with Protestantism'. Raising troops in his governate, he attempted first to surprise the city of Tours through a coup, with leading figures in the city to betray it to his forces, however the plot was betrayed, and Navarre suppressed the attempt on his city of residence. As such La Châtre brought his forces to Paris to aid in the defence of the city against attempts by Henri to reclaim the capital. Having arrived he took command of landsknechts defending the right bank of the Seine. In July while in the process of putting the city to siege, Henri was assassinated. Reign of Henri IV Montigny The attention of the ligue now shifted to face Navarre. La Chàtre meanwhile attempted to seize the town of Aubigny but was bested by a representative of the late king, Montigny who forced him to lift the siege. La Châtre's loyalty to the ligueur cause was even at this point, largely motivated by self interest, and he conspired against his fellow ligueur governor Boisdauphin for authority. Loyalist In February 1594 he abandoned his allegiance to the ligue, bringing over the cities of Orléans and Bourges to the royal camp in his liguer capacity as governor of Berry and the Orléannais. In return for bringing the towns over to the crown, he received 898,000 livres and a promise that his son would succeed to the lieutenant-generalcy of his governorship of Berry, while he would be maintained