Blitzkrieg, irruption.
The word is incursion. It means a sudden invasion or attack.
Attack
Apyphony.
Gust is another word for a sudden strong blast of wind.
Unexpected and really bad.
Panic, sudden, alert, are words for emergency.
U can call it depend on country. For example, Sudden Attack North America is SANA and Korean Sudden Attack is KSA
The word "raid" can function as both a noun and a verb. As a noun, it refers to a sudden attack or invasion, while as a verb, it means to conduct a surprise attack or invasion on a place or group.
A word that means to depart suddenly is "plump" or "plumped"
Although it has the actual mean of "sudden", the word is abrupt.
Yes, the noun 'invasion' is an abstractnoun; a word for an unwelcome intrusion into another's domain; an incursion by a large number of people or things into a place or sphere of activity; a word for a concept.
The base word for invasion is "invade."