
einberufen
to call up
To officially require someone to do military service or conscription service.
Er wurde mit 18 Jahren zur Armee einberufen.
He was called up to the army at the age of 18.
to call up / to convene
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to call up
To officially require someone to do military service or conscription service.
Er wurde mit 18 Jahren zur Armee einberufen.
He was called up to the army at the age of 18.

to convene
To officially cause a meeting, conference, or committee to assemble.
Der Vorstand hat eine außerordentliche Sitzung einberufen.
The board convened an extraordinary meeting.
'Einberufen' (to call up / to convene) is a separable verb. The prefix 'ein-' comes at the end of the sentence in a main clause. In subordinate clauses and in the infinitive, the verb stays together.
Der General beruft die Soldaten ein.
The general calls up the soldiers.
The verb is made up of the prefix 'ein-' and the verb 'berufen' (to appoint / to call). 'Berufen' means 'to call someone to an office or function.' The prefix 'ein-' strengthens the idea of bringing someone into a group or service.
Sie wurde in den Aufsichtsrat berufen.
She was appointed to the supervisory board.
The word 'einberufen' (to call up / to convene) belongs to formal official and administrative language. It is used in official contexts such as the military or company management.
Die Hauptversammlung wird für den 15. Mai einberufen.
The general meeting will be convened for May 15.
In the meaning 'to require someone to do military service,' 'einberufen' is very often used in the passive. The focus is on the person to whom the action happens.
Alle jungen Männer des Landes wurden zum Wehrdienst einberufen.
All young men in the country were called up for military service.
When referring to meetings, 'einberufen' is typically combined with nouns such as 'eine Sitzung' (a meeting), 'eine Konferenz' (a conference), 'ein Komitee' (a committee), or 'eine Versammlung' (an assembly).
Die Chefin hat kurzfristig eine Teamsitzung einberufen.
The boss convened a team meeting at short notice.
to move in / collect / absorb
Einziehen and einberufen can both refer to requiring someone to do military service. Einberufen emphasizes the official summons, for example in an official notice. Einziehen focuses more on calling the person up for service, without always drawing this distinction strictly.

Im Frühjahr berief das Militär mehrere junge Männer mit einem offiziellen Schreiben ein.
In the spring, the military called up several young men in an official letter.
Im Frühjahr zog das Militär mehrere junge Männer zum Dienst ein.
In the spring, the military drafted several young men.