A sudden invasion or hostile entry into a territory or domain

Latin 'incursio' (a running in, attack)

Intrusion Raid
Withdrawal Retreat
"Shashi Tharoor's column reads the 2013 Depsang episode as an incursion testing Indian resolve on the Line of Actual Control, the opening move in a decade-long pattern of pressure."

Standard usage in GS3 answers on border security, e.g., 'Repeated incursions across an undemarcated boundary are best met with both military posture and border-infrastructure investment.'

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