"The arming of Titans, must by necessity always be a compromise.  To gain long range you must sacrifice close combat ability, and vice versa.  You must approach this decission at two levels.  Firstly, the level of the individual Titan.  Consider carefully what it must achieve and how its' armament will affect its' ability to fulfil its' objective.  Secondly, the level of the force itself: this may be the legion as a whole, or a battle group on a particular mission.  Never forget that a titan force is a team - a single body, and may have specialized members designed for specific tasks."

- De Bellis Titanicus, attributed to Haran Jax

"Always endeavour to fight the nemy on your own terms.  If you are powerful at close quarters then engage in dense terrain where your advantage will prove the greatest.  If you are superior at long range then fight the battle at a distance.  If you have greater numbers then attack along an extened front, use reserves to break through when the enemy's lines have collapsed.  If outnumbered then concentrate your force so that the enemy can fight only your best troops.  No one ever won a battle who failed to take advantage of his enemy' weakness."

- Tactica Imperium

"Do not strike until you are reday to crush the enemy uterly, and then attack without mercy, destroy every vestige of resistance, leave no one to work against you."

- Tactica Imperium

"The supporting fire of one's brethren is always a comfort.  Provided it doesn't hit oneself"

- Grand Master Thordun Ranxey, Dead Bolts

"Used correctly, terrain is a seconmd weapon in your arsenal, equal to a Tian itself.  Make the battlefield work for you or you will find it working for your opponent."

- Grand Master Ferromort, Ordo Sinister, Divisio Militaris

"You strive for victory, that is obvous.  What may be less obvious is the nature of victory.  There are circumstances in which you can destroy the enemy utterly, without loss to your own force, and yet victory will be his.  In all situations you must first decide on the nature of victory, and then take steps to secure it.  Avoid the instinct to fight first and think later."

- Leman Russ Meditaions, Book VI 

"Martial vigour and ferocity are virtues, to be sure, but do not throw your forces blindly into the battle and say this vigour.  It is not.  Before commting your forces, examine the situation.  Review your own strengths and that of the enemy.  Remember your own objectives, and try to anticipate those of your enemy.  He who fights a battle without understanding places himself at a disadvantage."

 - Legion Astartes: Collects of War