Short answers, pulled from the story.
Feldzeugmeister Jozsef Alvinczi commanded the Austrian forces during the Battle of Caldiero. He launched his third attempt to raise the Siege of Mantua by crossing the Piave River with an army of 28,000 men.
The French suffered 1,000 killed and wounded plus 800 men and two artillery pieces captured during the battle. The Austrians lost 950 killed and wounded and 350 captured while defending their positions.
A violent rain and hail storm blew into the faces of the French troops during the morning assault and made it difficult for them to prime their muskets. The hail likely damaged the flintlock mechanisms used by the infantrymen and added chaos to the battlefield where visibility was poor.
Feldmarschall Dagobert Sigmund von Wurmser remained trapped in Mantua with a garrison of 23,708 men when Alvinczi launched his attack on the 2nd of November 1796. Of these soldiers only 12,420 were well enough to fight against the advancing Austrian columns.
General of Division Claude-Henri Belgrand de Vaubois commanded forces against Davidovich while General of Division André Masséna and General of Division Pierre Augereau engaged the Austrians directly. These three commanders deployed a total force of approximately 28,300 men across the Adige River to face the enemy positions.