1917 FIRST LOOK: Colin Firth and Benedict Cumberbatch star in Sam Mendes' new ...

The first trailer for Sam Mendes' epic war drama 1917 was released on Thursday.

Starring Benedict Cumberbatch and Colin First as battle-worn military men, the film follows two young soldiers who are tasked with an impossible mission to save the lives of 1600 men.

Set in the height of World War I, the intense teaser opens with leads George MacKay and Dean-Charles Chapman entering an underground bunker, supposedly used by their allies who were taken captive.

1917 FIRST LOOK: Colin Firth and Benedict Cumberbatch starred as battle-worn soldiers in the teaser trailer for Sam Mendes' new World War I epic, released on Thursday

1917 FIRST LOOK: Colin Firth and Benedict Cumberbatch starred as battle-worn soldiers in the teaser trailer for Sam Mendes' new World War I epic, released on Thursday

Arriving to find nothing but bare, steel bunk-beds, the trailer then takes a dramatic turn as an explosion detonates and the pair fight to escape their confines.

Colin's character then brings the pair in, informing them that they have to save an infantry of men by entering enemy territory and delivering a message to stop a deadly attack before its too late.  

Discussing the mission, Colin's character tells them: 'They’re walking into a trap, your orders are to deliver a message calling off the attack. If you don’t we will lose 1600 men, your brother among them.'

Soldier: Colin plays a battle-worn military man who appeals to the lead characters for their help in an impossible task

Soldier: Colin plays a battle-worn military man who appeals to the lead characters for their help in an impossible task

Drama: The film follows two young soldiers who are tasked with a mission to save the lives of 1600 men

Drama: The film follows two young soldiers who are tasked with a mission to save the lives of 1600 men

Showing the grisly conditions of the trenches, the duo are seen risking life and limb  traversing the French landscape and fighting off enemy soldiers to complete the task ahead of them.

One horrific scene even see's George's character Schofield pulling himself through a river full of corpses to avoid enemy gunfire.

While Benedict makes a brief appearance in the trailer, as he ominously declares: 'There is only one way this war ends, last man standing.'

Time is of the essence: Discussing the mission, Colin's character tells them: 'They’re walking into a trap, your orders are to deliver a message calling off the attack'

Time is of the essence:

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