user14202: What is a sharp line for White against the Philidor Lion: 
[FEN ""] 
1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7

with 4...e5
The majority of games seem to be slow positional battles where Black is quite solid.  4.g4 looks interesting, but are there other aggressive ideas?

user11609: As you mentioned, 4.g4 is interesting and not as stupid as it may look. If you don't like the positional maneuvering game, I think 4.f4 could be try for you. 
There is one suicidal line that really isn't my taste, but for sure it is aggressive, at least till you get mated. It's 
[FEN ""] 
1.e4 d6 2.d4 Nf6 3.Nc3 e5 4.Nf3 Nbd7 5.Bc4 Be7 6.Ng5 O-O 7.Bxf7+ Rxf7 8.Ne6

even some correspondence player advocated it for white, but I'm not sure I would prefer white's position here. Anyway, good to know such a line exists and is probably not complete nonsense.

14202: <p>What is a sharp line for White against the Philidor Lion: </p>

<pre><code>[FEN ""] 
1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7
</code></pre>

<p>with 4...e5</p>

<p>The majority of games seem to be slow positional battles where Black is quite solid.  4.g4 looks interesting, but are there other aggressive ideas?</p>
 11609: <p>As you mentioned, 4.g4 is interesting and not as stupid as it may look. If you don't like the positional maneuvering game, I think <code>4.f4</code> could be try for you. </p>

<p>There is one suicidal line that really isn't my taste, but for sure it is aggressive, at least till you get mated. It's </p>

<pre><code>[FEN ""] 
1.e4 d6 2.d4 Nf6 3.Nc3 e5 4.Nf3 Nbd7 5.Bc4 Be7 6.Ng5 O-O 7.Bxf7+ Rxf7 8.Ne6
</code></pre>

<p>even some correspondence player advocated it for white, but I'm not sure I would prefer white's position here. Anyway, good to know such a line exists and is probably not complete nonsense.</p>
