I had something exceptionally silly happen to me today.
I played as Isabella on a Terra map. I was tucked away in a corner of the continent and had the Indians and the English as neighbours. All of a sudden, Germany (who were far away from me) declared war and tried to take out my cities with Warriors and Archers... -_- As I had some Swordsmen I easily killed them all, then made peace with Bismarck who gave me all of his money as he had virtually no army left. After I made peace, ALL the Civs I had met, including my neighbours who I had had friendly relationships with so far, turned Guarded and started denouncing me for being a "Warmongering menace to the world"... WHAT!? Bismarck attacked ME, I killed his attack force, made peace, and now I'm a warmongerer? The AI in Civ needs some serious work.
Howdie All
I hope this helps calrify a few things.
PART 1 - WARMONGER
There seems to be a little confusion in the CIv V community when it comes to the WARMONGER status. I touched upon it in my previous post, but didn't really elucidate very well.
Your WARMONGER status, to the best of my knowledge, is only affected by your past use of force upon others (NOT your potential for using it ie your MILITARY STRENGTH).
Here are some factors to consider :
(1) Declaring WAR (for whatever reason) increases your WARMONGER status.
(2) Having WAR declared upon you does NOT affect WARMONGER status.
(3) IMPORTANT : Once you are at WAR it does not matter how the war was started, only what transpires during the confrontation.
(4) There is no penalty for destroying units.
(5) Conquering Cities adds to WARMONGER (Please note (3) above). Now I am unsure exactly what conquering entails, but at best guess it means annexing, puppeting or razing. I will investigate this further in the future when I have time. It is not clear at the moment if any of these factors are worse then any other. I know many in the forums suspect that razing is worse then annexing, for example. I have yet to find evidence of this (in the XML, logs etc), even though it seems like a reasonable and likely proposition. I will look into this further when I have more time.
(6) Each Civ hasd a WARMONGER bias, in general the more aggresive civs are less susceptible to your conquering actions. Have a look at Bibors personality sheet to get an idea of who is likely to get upset the fastest.
(7) Unlike several other mechanics the WARMONGER mechanic has a Personality modifier. I have yet to determine its affect but it is likely that it is a scaling factor of some form that acts on the WARMONGER bias of each civ. In short this would mean that a rating of 10 is more then double a rating of 5, for example. This is only conjecture at the moment and may well be incorrect, but it is worth considering none-the-less.
(8) Things get a little tricky when moving to the higher WARMONGER status (CRITICAL and SEVERE). There is a scaling factor involved here too. Ii is unlcear at the moment its affect, but it may mean that as your WARMONGER threat climbs higher, each transgression counts less.
(9) Declaring WAR on a CS is just as bad as declaring on a major civ.
(10) Conquering a CS is just as bad as conquering a major civ cities.
(11) Attacking CS also contributes to your CS Aggressive status.
PART 2 Addressing svett89
In your example, and based on the limited information i have, there are three possibilities for what may have happened.
(1) You conquered some of the German cities, increasing your WARMONGER status which then negatively impacts OPINION, which then negatively impacts APPROACH (Guarded, Hostile etc)
(2) Your troops attained prmotions, or upgrades, you built extra units, you increased your financial reserve etc, thus increasing your MILITARY STRENGTH. Your MILITARY THREAT would then be (due to your MILITARY STRENGTH) in addittion to your actions during the war. MILITARY THREAT is responsible for increasing both the GUARDED and AFRAID APPROACHES (and HOSTILE if you are determined to have NO comparitive strength).
(3) Both (1) and (2).
You should note that every Civ ALWAYS has an exact approximation of your MILITARY STRENGTH, based on your soldiers, their promotions, how much money you have, number of cities et al. This measurement is made regardless of whether they have scouted your cities or not and is approximated by the SOLDIERS variable in the DEMOGRAPHICS screen. If you see your rank going up then expect more points going toward GUARDED and AFRAID and a greater chance of civs switching to this APPROACH. If you see your rank going down then expect to see points coming off of GUARDED and AFRAID. If you ever are estimated as having NO MILITARY STRENGTH (note this actually does not mean NONE, just less then a MINOR rating) then the AI receives a large increase to the HOSTILE APPROACH. The reason is simple : "Because they can".
Finally your WARMONGER rating could have been anywhere from MINOR to CRITICAL depending on your actions throughout the game. Unfortunately the UI does not show this.
In summary you may have had points already accrued in WARMONGER but below the necessary threshold to obtain a penalty; had you conquered and CS or major Civ cities prior to the war, had you previously declared war, how many cities of the germans did you take, what is Warmonger BIAS of your neighbours. If the answer to these questions are, I didn;'t take any cities, never declared war, didn't beat up on CS etc, then I am at a loss to explain why you had a WARMONGER status.
Remember you can use your MILITARY STREGTH to manipulate the AI. I use it to let the AI think I am weaker then what I am and encourage them to attack. Then I upgrade my units, teach them, a lesson and accept a beneficial peace treaty, without taking a WARMONGER hit for attacking them.
Once an AI goes GUARDED, they belong to one of two camps.
(1) Their opinion is still in your favour and they are just concerned by your MILITARY STRENGTH (more likely if you don't have a WARMONGER status, or have returned Civilians/DOFs etc). Try to bring these AI's back to the fold.
(2) They don't like you much and are only prevented from being openly HOSTILE or declaring WAR by your MILITARY THREAT. There not afraid of you but they do respect your potential.
NOTE : Just because the civs have a reasonably accurate estimation of your MILITARY STRENGTH does not mean they know where your units are positioned. They only see what their units can see and no more.
On a final note, remember that the CIV APPROACHES are not like Civ Opinions. Opinions are a sliding scale measured witha single number. Your OPINION is determinedf solely by that number. On the other hand APPROACH (GUARDED, NEUTRAL, FRIENDLY etc) are ratings that are measured SEPERATELY each turn, with the highest being adopted as the AI's approach to you. So don't think of GUARDED as HOSTILE, the AI could have a FAVOURABLE (or higher) OPINION of you and still be GUARDED (usually due to a high MILITARY THREAT). Then again the AI can hate your guts and be GUARDED because your MILITARY THREAT keeps them in check. Usually GUARDED is accompanied by a military build up on their borders, "ie get your eyes of my dang capital, or my GDR will learn yah!"
. As there troop levels are going up at this point, then your relative MILITARY THREAT often is going down at the same time, which can then lead to them flicking to HOSTILE/WAR or NEUTRAL/FRIENDLY depending upon their OPINION of you. If they go HOSTILE/WAR their troops are then in a position to invade.
I hope this helps you svett, and any others. I also hope that you do not take my response as a criticism of your style of play, it certainly is not meant in that vein. I am only trying to explain what "might" have happened.
PS Apologies for the many typos, I am doing this on my coffee break. Also sorry for the long post.
NOTE : MILITARY STRENGTH is an approximation of your total MILITARY STRENGTH (units, promotions, gold, unit strength/type, etc). MILITARY THREAT is fed by MILITARY STRENGTH but alos reflects your behaivior throughout the game (Wars, Conquering etc). MILITARY THREAT is the one that feeds into APPROACH, MILITARY STRENGTH only affects MILITARY THREAT. IN a way civs can be doubly penalised when going on the warpath (through MILITARY THREAT-APPROACH and WARMONGER-OPINION-APPROACH), although MILITARY THREAT only really affects GUARDED/AFRAID.