Short answers, pulled from the story.
A decree merged three separate coastal armies to create the Army of the West on the 2nd of October 1793. The Army of the Coasts of La Rochelle joined forces with the so-called Army of Mayence and part of the Army of the Coasts of Brest.
Louis Marie Turreau began a bloody program on the 24th of January 1794 using 12 infernal columns. Thomas-Alexandre Dumas took command on the 16th of August when strength had dropped to 45,000 men.
The Battle of Cholet on the 17th of October 1793 saw 25,000 Republicans defeat 40,000 rebels. Losses were heavy for both sides, with 8,000 rebel casualties against 4,000 Republican losses.
The French government combined the Army of the West with other coastal armies into a single force under Hoche on the 26th of December 1795. This new entity had a nominal strength of 182,956 but only 100,000 men were present for duty.
Henri François Delaborde led the army from mid-November until its suppression on the 20th of May 1802. The district was reduced to just the 13th Military Division on the 23rd of September 1801.