Minesweeper Puzzle

Place the pieces into the grid.  The pieces will overlap.  When completed, every cell will hold a number or a mine.  As in classic minesweeper, each number in the finished grid represents how many neighboring squares hold mines.  Do not rotate or reflect the pieces.

1. 3x3 puzzle
             
             
             
             
4     M      
  M   3      
             
M 3   2      
        M    
M            
             
             
 
2. 4x4 puzzle    
             
             
             
             
             
4   2        
      5      
M M   M      
             
2 M     1    
    M        
        M    
  M          
      2      
2            
    M 4      
             
Source: Original.
Solutions were received from Kirk Bresniker, Dan Chirica, David Bachtel, Claudio Baiocchi, Alan O'Donnell, and Joseph DeVincentis.  There is only one way to solve each puzzle.
1. 3x3 puzzle
2 4 M    
M M M    
3 M 3    
         
 
2. 4x4 puzzle  
1 2 M 2    
2 M 4 M    
M 5 M 4    
2 M M M    
           
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