In terms of military strength, Ireland has a slight edge over Lithuania in terms of troop numbers. However, Lithuania has a larger air force and navy. The terrain of both countries is also quite similar, with rolling hills and forests. This would make it difficult for either side to gain a significant advantage.
The strategies employed by each side would also play a major role in determining the outcome of the war. If Ireland were to focus on a defensive strategy, it could use its natural advantages to make it difficult for Lithuania to advance. However, if Lithuania were to take the initiative and launch a surprise attack, it could catch Ireland off guard and gain an early advantage.
Finally, the level of support from allies would also be important. Ireland is a member of the European Union, while Lithuania is a member of NATO. This would give both countries access to additional resources and support if the war escalated.
In conclusion, it is impossible to say for certain who would win a war between Ireland and Lithuania. The outcome would depend on a number of factors, including the terrain on which the war was fought, the strategies employed by each side, and the level of support they received from their allies.