Possibly soldiers in combat in World War One. it was a side effect of what was called Shell Shock from deafening artillery and bomb shock waves- not to mention poison gas, also used in this conflict.
Amnesia
Forgetting to do something is not amnesia. Forgetting that you did something could be amnesia.
how can you describe a person with amnesia
No Harriet Tubman did not have amnesia.
"The woman had an accident and is suffering from amnesia."
In general this is called amnesia and someone who has amnesia is called an amnesiac. Another more 'scientific' term is dementia which covers not just loss of memory but a diminished intellectual ability.
no
End of Amnesia was created in 2001.
Instant Amnesia was created in 2003.
Amnesia - novel - was created in 1992.
Amnesia
Amnesia is a Move that boosts up Special Defense.