Question

You kept him at the tip of the spear...

Answer 1

These pages can help:

http://forum.wordreference.com/showthread.php?t=1457374

http://forum.wordreference.com/showthread.php?t=1882604

Answer 2

(جنگ و جبهه)

تو شرایط جنگی نگهش داشتی!

تو  مجبورش کردی تو خط مقدم بمونه!

تو گذاشتیش که تو صف اول نبرد باشه!

تو فرستادیش تو دهن کوسه!

http://forum.wordreference.com/showthread.php?t=1457374

 

Provision of surrounding text may help better assistance.

Comments

Awaiting your comment Mahtab...

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To be honest, I found this sentence in "prison break"

I just posted this question cos I had no idea about it...

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Does it match the context in the movie?

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I don't know, maybe It doesn't

Here is the context:

the "him" had betrayed the commander and the commander blamed one of his people

and said "You hired him, You kept him at the tip of the spear..."

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The tip of the spear is what makes it different from a blunt pole. So if you keep someone at the tip of the spear, you make them important.

See also Spearhead (v.)

and http://www.urbandictionary.com/define.php?term=tip%20of%20the%20spear