C :: Expected Expression Before Token

I wrote a program, that generates 20 random integers, and stores them in an array. Then I decided, to build more functions to it, i.e why not have it to display the lowest integer of an array. I created my function,

Code:
int minValue( int field[ ] )

and got my code in side, which (technically) works. In my main() function I'm calling

Code:
printf( "The smallest value of an array is: %d
", minValue( field[] ) );

and I'm getting an error trying to compile it.

Code:
randomArray.c:62:74: error: expected expression before ']' token
printf( "The smallest value of an array is: %d
", minValue( field[] ) );