
überrennen
to overrun
To conquer, occupy, or flood a place or a group of opponents through a fast, massive attack or a large number of people.
Die Fans überrannten nach dem Sieg das Spielfeld.
After the victory, the fans overran the playing field.
to overrun
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to overrun
To conquer, occupy, or flood a place or a group of opponents through a fast, massive attack or a large number of people.
Die Fans überrannten nach dem Sieg das Spielfeld.
After the victory, the fans overran the playing field.

to run over
To bump into someone while running or racing and knock them down.
Pass auf, dass du im Gedränge die kleinen Kinder nicht überrennst!
Be careful not to run over the little children in the crowd!
'Überrennen' (to overrun / to run over) is an inseparable verb. The prefix 'über-' remains firmly attached to the verb 'rennen' (to run) in all tenses and sentence constructions.
Die Angreifer überrannten die Verteidigungslinie.
The attackers overran the defensive line.
This verb is always transitive and requires an accusative object. You always 'überrennt' (overrun / run over) someone or something.
Eine große Welle von Touristen überrennt jeden Sommer die kleine Stadt.
A large wave of tourists overruns the small town every summer.
In the meaning 'erobern' (to conquer) or 'überfluten' (to flood), the subject is typically a large group (fans, soldiers, tourists), and the object is a place (playing field, town) or an opposing group.
Die Armee überrannte die feindlichen Stellungen in nur wenigen Stunden.
The army overran the enemy positions in just a few hours.
In the meaning 'umstoßen' (to knock over), it is usually a single person or a vehicle that accidentally bumps into another person and knocks them down. The context is often haste or carelessness.
Der Radfahrer hat in der Eile beinahe einen Fußgänger überrannt.
In his hurry, the cyclist almost ran over a pedestrian.
to storm
Both stürmen and überrennen can refer to a rapid attack on an opposing position. Stürmen emphasizes the forceful attack and the attempt to capture the target; überrennen additionally highlights that the resistance is broken through sheer speed or superior numbers.

Die weit überlegenen Soldaten überrannten die gegnerische Stellung in wenigen Minuten.
The vastly superior soldiers overran the opposing position within a few minutes.
Die Soldaten stürmten die gegnerische Stellung nach einem kurzen Angriff.
The soldiers stormed the opposing position after a brief attack.