1) Engines collectively 2) Engines of war collectively 3) Machinery 
• (n.) Any device or contrivance; machinery; structure or arrangement. • (n.) Engines, in general; instruments of war. • (n.) The act or art of managing engines, or artillery.
En'gine·ry noun 1. The act or art of managing engines, or artillery. Milton. 2. Engines, in general; instruments of war. « Training his devilish enginery .» Milton. 3. Any device or contrivance; machinery; structure or arrangement. She...
[n] - machinery consisting of engines collectively
noun machinery consisting of engines collectively
engines collectively; machinery. · engines of war collectively. · skillful or artful contrivance.