Hello Dockendor, good to see you post once more.
As for your question, it's normal that the players are talking about these numbers. 1 city has, with the right buildings and techonologies, 3500 total farm space. You will use up about 800~1000 of this for population, and another 800~1000 population on transporters and lightship escort. So, this would leave you with about 1700 free population (for land offense cities), to spend on offensive units as slingers, horsemen and catapults. Now, lets say you decided to take 1400 slingers and 20 catapults as offensive army; this is just
one city, you can build many more cities like this.
Now look at it from defensive perspective. First off, we don't need 25~50 LS guidance, so we can drop a good ammount of light ships and invest those 250~500 population slots for defensive units. For now, we'll just asume we
know our enemy makes use of a majority of slingers; we'll have about 2000 population to build defensive troops with, and looking at the stats, swordsmen would win from the slingers (Slingers have 23 distance offense, swordsmen have 30 distance defence). Because there always is a slight chance of the enemy bringing along a few unexpected units (hoplites or chariots would be a real killer for your swordsmen), you should alter your army slightly, but you will have to find your own preference in this,
nobody can tell you what is the
best defence, because there's such a large variety of players in Grepolis, there is also a large variety of effective defences.
Now, as we are the deffender, we'll have even more advantages: First off, the wall, obviously. When fully expended, it gives about 137% defensive bonus. In short, you theoretically have your troops multiplied by *2.37, so 1000 swordsmen would fight with the strength of 2370 swordsmen; quite nice, isn't it?
Second off, we can build a tower, which adds another 10% defensive bonus: Neat!
Third; Militia. At the cost of lowering your resource production for 6 hours (Speed worlds: 6/server speed), you will get 10 militia per farm level (15 with city guard researched -> Recommended for
all cities). This effect cancles itself after any farm level beyond 25, so your maximum ammount of militia will be 375; They are free, get the bonus from wall/tower and won't give Battle points to the attacker, which is, in later game, one of the most valuable 'resources' you can get when attacking another player.
All in all, it's quite obviouse the deffender has a huge advantage over the attacker, especially because the deffender can also stack all his units in 1 city, creating a massive army, and the attacker must send seperate, smaller attacks. That's why we, as attackers, shouldn't just blindly send our attacks at someone to have them arive at certain death; we must get to know our enemy, learn from his strategy, and use his own technique's against him. It's why Grepolis is a strategy based browsergame, and not SimCity