Leonardo da Vinci: The Ingenious Engineer of Renaissance

Leonardo da Vinci worked for Duke Ludovico Sforza, creating art and engineering projects. He painted 'The Virgin of the Rocks' and 'The Last Supper' and provided engineering advice. One major project was a 24-foot bronze horse, which was halted due to war.

What significant project did Leonardo da Vinci work on for Duke Ludovico Sforza that involved a bronze horse?

What halted the completion of the bronze horse sculpture designed by Leonardo?