There's a difference. Always honor a threat. The weight of all your equipment is proportional to the cube of the time you have been carrying it. Hell hath no fury like a non-combatant. A lost battle is a battle one thinks one has lost.
Surprise is an event that takes place in the mind of a commander.
All warfare is based upon deception. The enemy diversion you are ignoring is the main attack. Radios function perfectly until you need fire support. Parade ground inspections are to combat readiness as mess hall food is to cuisine. The tank is a monument to the inaccuracy of indirect fire.