to muster / summon
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muster
To mobilize all available strength, resources, or effort in order to achieve a goal. Often used in the phrase 'alles aufbieten' (to muster everything).
Die Rettungskräfte mussten ihr ganzes Können aufbieten, um die Verletzten aus dem Wrack zu befreien.
The rescue workers had to muster all their skill to free the injured people from the wreckage.
'Aufbieten' (to muster / summon) is a separable verb. The prefix 'auf-' comes at the end of the main clause. In subordinate clauses or in the infinitive with 'zu', the verb stays together.
Er bot seine ganze Kraft auf, um den Stein zu heben.
He mustered all his strength to lift the stone.
In the meaning of 'mobilize', 'aufbieten' (to muster) is often combined with abstract nouns such as 'Kraft' (strength), 'Mut' (courage), 'Geduld' (patience), or 'Können' (skill). A very common phrase is 'alles aufbieten' (to muster everything).
Sie musste ihre ganze Geduld aufbieten, um den Kindern zuzuhören.
She had to muster all her patience to listen to the children.
The meaning 'to call people together' is rare today and is usually used in historical or very formal legal contexts. You see it when kings gather armies or courts summon witnesses.
Das Gericht kann Zeugen aufbieten, um den Fall zu klären.
The court can summon witnesses to clarify the case.
to insert / to begin / to use
'einsetzen' and 'aufbieten' can both mean that you use people, strength, or resources for a goal. 'einsetzen' is neutral and fits ordinary planning: you use personnel, money, or technology. 'aufbieten' sounds stronger. It means that you mobilize many or all available forces, often because the task is difficult. It can also mean that people are specially summoned. Learners may confuse the words because both have to do with resources. However, 'aufbieten' is more appropriate when a special effort is involved.
Das Team bot alle Kräfte auf, um das Spiel noch zu gewinnen.
The team mustered all its strength to still win the game.
Die Stadt setzt mehr Busse ein, weil so viele Besucher kommen.
The city is putting on more buses because so many visitors are coming.