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They changed it because the machine gun fire wouldn't let the troops advance ( charge ). It also changed it because no light Armor ( Jeeps and Motorbikes ) could get past it with out losing a crew member or 2.
it changed by... well it changed... It just changed!
The simple past tense (and also the past participle) is attacked.
The past participle is battled. This is also the case for the simple past tense.
no, Argentina has not changed. but the president has
YES, most true submersibles have a 'pilot' and a systems operator. The submersibles that do not carry people are usually called ROV's or AUV's
The past tense of change is changed.
Very small, if it even exists. Most submersibles do not carry cargo
Deep sea submersibles help get research from the ocean floor.
alvin
july 21, 1856
John Wilkes Booth did
no
The past participle is changed.
* == ==
Changed.
Submersibles work on undersea oilwells, recover practice torpedoes, search for sunken ships or things that have fallen off ships and sunk.