Retrograde Mercury Square Mars...

starts on April 24 (using a 1 degree orb), is exact on April 25 at 8.41pm in Kilmore, leaves on April 26.  Retrograde Mercury at 10 degrees and 19 minutes of Taurus, Mars at 10 degrees and 19 minutes of Leo.

My first thought with this aspect is... 'learn to bite your tongue'!

Retrograde Mercury has a habit of causing confusion when communicating with others so it is likely that something or someone that has been causing problems for you is simply or at least partially just a case of misunderstanding.  This is one of the main reasons that during the square that it is important to double check 'facts', and not to assume anything.

However, regardless of what happens, this energy can also mean that the air is cleared... the square aspect generally provides an opportunity to reach a cross-road or turning point in the relationships and situations represented by the houses and planets involved.

As usual, look to which houses Mercury and Mars are in, and which houses are ruled by them (Mercury = houses with Gemini or Virgo on the cusp, Mars = houses with Aries or Scorpio on the cusp) in order to get a feeling for where you are likely to need diplomacy and tact.  If you have personal planets in Taurus and/or Leo then this energy is likely to be more prominent for you.