Tactitition

 it is best to fight the enemy with the light behind you, and best when He or She does not know you. and if you attack an enemy, make sure it is true so that one would be through and could never attack you.

Leonardo Da Vinci would best say it this way:

iɈ iƨ dɘƨɈ Ɉo ʇiϱʜɈ Ɉʜɘ ɘnɘmγ wiɈʜ Ɉʜɘ liϱʜɈ dɘʜinb γoυ ɒnb dɘƨɈ wʜɘn Hɘ oɿ Ƨʜɘ boɘƨ noɈ ʞnow γoυ ɒnb iʇ γoυ ɒɈɈɒɔʞ ɒn ɘnɘmγ mɒʞɘ ƨυɿɘ iɈ iƨ Ɉɿυɘ ƨo ɈʜɒɈ onɘ woυlb dɘ Ɉʜɿoυϱʜ ɒnb ɔoυlb nɘvɘɿ ɒɈɈɒɔʞ γoυ