TwitchALot, do you disagree that cannons are weapons of offense which would make them arms?
"Cars" and "Trucks" are different but they are both vehicles. "Ordnance" is just a specific class of arms, same as "Trucks" are a specific class of vehicle. You can get more into a truck than a car same as you get more firepower from a cannon than a rifle. Both will "get you there", albeit one with more than the other, but you get there all the same.
When it's up to one against a hundred, or moving your household goods a hundred miles, the cannon would be the arm of choice as would be the truck.
Besides, the Second Amendment covers arms and doesn't break weapons down to the specific categories, same as it doesn't break down the armour you may have into specific categories. What you and Smeg are saying is that it would be possible for the government to limit you to hiding behind no bigger than a six inch diameter tree in a gun battle, or that bunkers would only be accessible to soldiers, or that shelters would only be accessible to government officials and you couldn't own one for yourself.
But please, do go to the library. You might want to check the many dictionaries on line, too.
Consider this as well: What good would letters of marque and reprisal be if those private vessels had no cannon?
Woody
Look at your rights and freedoms as what would be required to survive and be free as if there were no government. Governments come and go, but your rights live on. If you wish to survive government, you must protect with jealous resolve all the powers that come with your rights - especially with the Right to Keep and Bear Arms. Without the power of those arms, you will perish with that government - or at its hand. B.E. Wood