Third task is to draw a class diagram based on the following problem: There is a country that has cities and lot of roads between them. Cities and roads can be filled with traveling units (there are at least horse carriages, knight convoys and donkeys). When a traveling unit is in the road there is a change that bandit comes and captures it. The bandit can tow traveling units to a farm and hide them there. Every traveling unit has a driver that has nationality and name. Traveling units have also number of wheels/legs and weapons. Some of them can fire and some cannot. All the traveling units can move, but their max speed varies.

Sure, based on the given problem, here is a class diagram that represents the entities and their relationships:

+-----------------+            +-----------------+
|     Country     |<>----------|      City       |
+-----------------+            +-----------------+
|                 |            |                 |
| - name          |            | - name          |
| - cities        |            | - roads         |
|                 |            |                 |
| + addCity()     |            | + addRoad()     |
| + removeCity()  |            | + removeRoad()  |
+-----------------+            +-----------------+

         ^
         |
         |
         |
         |
         |
+----------------------+
|   TravelingUnit      |
+----------------------+
|                      |
| - type               |
| - driver             |
| - wheels/legs        |
| - weapons            |
| - canFire            |
| - maxSpeed           |
|                      |
| + move()             |
| + captureByBandit()  |
+----------------------+

         ^
         |
         |
         |
         |
         |
+---------------------+
|       Driver        |
+---------------------+
|                     |
| - nationality       |
| - name              |
|                     |
+---------------------+

Explanation:
- The `Country` class represents a country and has a relationship with multiple `City` objects through the `cities` attribute. It also has attributes like `name` and methods like `addCity()` and `removeCity()` for managing cities.
- The `City` class represents a city and has a relationship with multiple `Road` objects through the `roads` attribute. It has attributes like `name` and methods like `addRoad()` and `removeRoad()` for managing roads.
- The `TravelingUnit` class represents a traveling unit and contains attributes like `type`, `driver`, `wheels/legs`, `weapons`, `canFire`, and `maxSpeed`. It has methods like `move()` for moving the unit and `captureByBandit()` for capturing the unit.
- The `Driver` class represents a driver and contains attributes like `nationality` and `name`. It is associated with the `TravelingUnit` class.

Note: This is a basic representation of the system based on the given problem statement. There might be additional classes or relationships required depending on the specific requirements of the system.