With outstanding expertise in mechanical inventions, Rittenhouse was soon involved in organising the manufacture of armaments such as cannon and ammunition, chains to fortify the harbour, as well as gunpowder.
Na may natitirang kadalubhasaan sa makina imbensyon, Rittenhouse sa lalong madaling panahon ay kasangkot sa organising ang paggawa ng armaments tulad ng mga kanyon at ammunition, chains upang pagtibayin ang mga mag-iwi, pati na rin ang pulbura.